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Profile The Gas Giant
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Message 33112 - Posted: 7 Nov 2009, 1:22:40 UTC

Cruncher's MW Concerns.

Lack of cached wu's on GPUs. With a wu taking 55 seconds or less, for my machine with 2 * GPUs in my quady, that gives me just under 15 minutes of wu's cached. Be nice to have 30 to 60 wu's cached per GPU.
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Message 33120 - Posted: 7 Nov 2009, 6:32:29 UTC - in response to Message 33090.  

Thank you.
So they should all take about the same amount of time on same hardware? And by how much variation in run times should be considered normal? I am asking this because I discovered that there may be some other instabilities besides VPU recovers caused by combination of MW and 9.10 drivers, and would like to be able to detect them properly instead of making false assumptions and accusations.
BR,


The current workunits should all take pretty much the same time.
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Message 33121 - Posted: 7 Nov 2009, 6:34:13 UTC - in response to Message 33105.  

The only thing I missing here is information, a short briefing about what happening in front page or a mail to top users whats going on, then they probably post a message to some shouts or team site. MV is now my second boinc project because if collatz is running, it take all gpu ignoring MW/collatz boinc share, fix that please.


Regarding your request these were posted on the Front Page today:

Large WU Sizes
November 4, 2009
I've started some new searches with larger sized workunits, so hopefully these will help the server strain. Let us know how they're running.
--Travis


Website Slowness
November 4, 2009
We've been looking into the website performance and it looks like we're going to be ordering some more hardware in the next couple weeks which should improve the performance. Until then you're probably just going to have to bear with the website slowness. I'm currently trying to finish up my phd thesis (I defend in less than 2 weeks), so I probably won't be frequenting the forums very much until then.
--Travis


Yep, that is your/my/all crunchers here/problem? Admins here always, almost one week behind reporting whats going on here on server side. Only thing that I ask is little short briefing in less than one week time.



You're probably going to have to bare with me for the next couple weeks while I finish writing my PhD dissertation. After that I'll have a lot more time to watch (and update) the server and keep you guys informed.
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Message 33122 - Posted: 7 Nov 2009, 6:35:34 UTC - in response to Message 33112.  

Cruncher's MW Concerns.

Lack of cached wu's on GPUs. With a wu taking 55 seconds or less, for my machine with 2 * GPUs in my quady, that gives me just under 15 minutes of wu's cached. Be nice to have 30 to 60 wu's cached per GPU.


Sadly this has been a problem with the project since it's inception. Due to what we're doing here our WUs need a somewhat faster turn around time, so chances are you're not going to be able to queue up too much work.

Also, with the server in it's current struggling state, letting people have more WUs in their queue only slows it down farther, so it's not something we can really change.
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Message 33126 - Posted: 7 Nov 2009, 11:05:59 UTC - in response to Message 33122.  

Cruncher's MW Concerns.

Lack of cached wu's on GPUs. With a wu taking 55 seconds or less, for my machine with 2 * GPUs in my quady, that gives me just under 15 minutes of wu's cached. Be nice to have 30 to 60 wu's cached per GPU.


Sadly this has been a problem with the project since it's inception. Due to what we're doing here our WUs need a somewhat faster turn around time, so chances are you're not going to be able to queue up too much work.

Also, with the server in it's current struggling state, letting people have more WUs in their queue only slows it down farther, so it's not something we can really change.

I was talking about the future.....once the new hardware is operational.
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Message 33131 - Posted: 7 Nov 2009, 16:26:14 UTC - in response to Message 33126.  

Cruncher's MW Concerns.

Lack of cached wu's on GPUs. With a wu taking 55 seconds or less, for my machine with 2 * GPUs in my quady, that gives me just under 15 minutes of wu's cached. Be nice to have 30 to 60 wu's cached per GPU.


Sadly this has been a problem with the project since it's inception. Due to what we're doing here our WUs need a somewhat faster turn around time, so chances are you're not going to be able to queue up too much work.

Also, with the server in it's current struggling state, letting people have more WUs in their queue only slows it down farther, so it's not something we can really change.

I was talking about the future.....once the new hardware is operational.


Wouldn't it be nice to just not have these continual struggles?

The answer isn't more of the same size tasks you all get now. The answer still will be longer running tasks for GPUs. It doesn't matter to me if they get the same credit per second as they do now, they just need to be on the order of 100 times longer...
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Message 33136 - Posted: 7 Nov 2009, 23:44:36 UTC - in response to Message 33131.  

It doesn't matter to me if they get the same credit per second as they do now, they just need to be on the order of 100 times longer...

It really makes me wonder sometimes. Just two posts below Travis says "Due to what we're doing here our WUs need a somewhat faster turn around time"

How do your 100 times longer WUs make for faster turn around time?


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Message 33139 - Posted: 8 Nov 2009, 0:23:27 UTC - in response to Message 33136.  

It doesn't matter to me if they get the same credit per second as they do now, they just need to be on the order of 100 times longer...

It really makes me wonder sometimes. Just two posts below Travis says "Due to what we're doing here our WUs need a somewhat faster turn around time"

How do your 100 times longer WUs make for faster turn around time?

They would then take an hour or so like the cpu wus do. How is that not better? Then each gpu would have a days work or more instead of 15 min.
Doesn't expecting the unexpected make the unexpected the expected?
If it makes sense, DON'T do it.
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Message 33140 - Posted: 8 Nov 2009, 0:27:50 UTC - in response to Message 33139.  

It doesn't matter to me if they get the same credit per second as they do now, they just need to be on the order of 100 times longer...

It really makes me wonder sometimes. Just two posts below Travis says "Due to what we're doing here our WUs need a somewhat faster turn around time"

How do your 100 times longer WUs make for faster turn around time?

They would then take an hour or so like the cpu wus do. How is that not better? Then each gpu would have a days work or more instead of 15 min.

I should imagine that there is a scientific/research reason for the length of a WU. It's like trying to suggest stuffing a hundred days food into your pet dog on day one just to make life more convenient for you.


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Message 33141 - Posted: 8 Nov 2009, 1:34:37 UTC - in response to Message 33140.  

It doesn't matter to me if they get the same credit per second as they do now, they just need to be on the order of 100 times longer...

It really makes me wonder sometimes. Just two posts below Travis says "Due to what we're doing here our WUs need a somewhat faster turn around time"

How do your 100 times longer WUs make for faster turn around time?

They would then take an hour or so like the cpu wus do. How is that not better? Then each gpu would have a days work or more instead of 15 min.

I should imagine that there is a scientific/research reason for the length of a WU. It's like trying to suggest stuffing a hundred days food into your pet dog on day one just to make life more convenient for you.

Travis already said and promised gpu wus 100x longer months ago. He said they had more complex data that could be crunched, so yes it would be scientific.
Doesn't expecting the unexpected make the unexpected the expected?
If it makes sense, DON'T do it.
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Message 33144 - Posted: 8 Nov 2009, 7:52:29 UTC - in response to Message 33141.  
Last modified: 8 Nov 2009, 7:54:03 UTC

It doesn't matter to me if they get the same credit per second as they do now, they just need to be on the order of 100 times longer...

It really makes me wonder sometimes. Just two posts below Travis says "Due to what we're doing here our WUs need a somewhat faster turn around time"

How do your 100 times longer WUs make for faster turn around time?

They would then take an hour or so like the cpu wus do. How is that not better? Then each gpu would have a days work or more instead of 15 min.

I should imagine that there is a scientific/research reason for the length of a WU. It's like trying to suggest stuffing a hundred days food into your pet dog on day one just to make life more convenient for you.

Travis already said and promised gpu wus 100x longer months ago. He said they had more complex data that could be crunched, so yes it would be scientific.

OK, I missed that. It would certainly make a radical difference. But given the reality of rate of progress here in MW and the possibilities becoming a reality, Travis may as well say that this project is aiming to put the first donkey on Mars by the year 2012. Not meant to be a criticism of Travis, I'm just saying we can make the best of what we have and leave the pie in the sky for when it happens.

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Message 33149 - Posted: 8 Nov 2009, 13:53:40 UTC - in response to Message 33144.  
Last modified: 8 Nov 2009, 14:05:28 UTC


Travis already said and promised gpu wus 100x longer months ago. He said they had more complex data that could be crunched, so yes it would be scientific.

OK, I missed that. It would certainly make a radical difference.


Yes, it indeed would... That was the whole premise behind MW_GPU. The current tasks are still within the range of CPUs. If they moved you all off to the other project and did the more complex work, they could be getting a LOT more done. If they were concerned about faster turnaround here, they could give you all the 3-stream (3s) tasks as well, leaving the 1 and 2-stream tasks here.

But given the reality of rate of progress here in MW and the possibilities becoming a reality, Travis may as well say that this project is aiming to put the first donkey on Mars by the year 2012. Not meant to be a criticism of Travis, I'm just saying we can make the best of what we have and leave the pie in the sky for when it happens.


So, here's the choice... If the new hardware makes it to where site and work availability are at manageable levels for the project, should the project keep it that way, or increase the workload to yet again get to the point that we're at now, thus requiring even more new hardware?

If the project is happy with not having to babysit the servers as much and happy with the rate that the research is happening, then what exactly gives you the right to demand they do otherwise? Yes, I know that you are providing a service and you can stop providing services at any time that you choose, but to me that is not "being a team player". If the new server goes in and it makes their life easier and they want to keep it that way for a while, then you should be respectful of that.
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Message 33157 - Posted: 8 Nov 2009, 22:31:55 UTC - in response to Message 33121.  
Last modified: 8 Nov 2009, 23:07:40 UTC

The only thing I missing here is information, a short briefing about what happening in front page or a mail to top users whats going on, then they probably post a message to some shouts or team site. MV is now my second boinc project because if collatz is running, it take all gpu ignoring MW/collatz boinc share, fix that please.


Regarding your request these were posted on the Front Page today:

Large WU Sizes
November 4, 2009
I've started some new searches with larger sized workunits, so hopefully these will help the server strain. Let us know how they're running.
--Travis


Website Slowness
November 4, 2009
We've been looking into the website performance and it looks like we're going to be ordering some more hardware in the next couple weeks which should improve the performance. Until then you're probably just going to have to bear with the website slowness. I'm currently trying to finish up my phd thesis (I defend in less than 2 weeks), so I probably won't be frequenting the forums very much until then.
--Travis


Yep, that is your/my/all crunchers here/problem? Admins here always, almost one week behind reporting whats going on here on server side. Only thing that I ask is little short briefing in less than one week time.



You're probably going to have to bare with me for the next couple weeks while I finish writing my PhD dissertation. After that I'll have a lot more time to watch (and update) the server and keep you guys informed.


Thanks for this weekend, briefing was good on front page, server almost working all this time, and I happy to crunch here. Thanks to Travis and all the admins here! And we are still needing more admins over the pool to brief the crunchers.
Good luck Travis on your phd thesis, but you really don't need it, all is going to go fine.
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Message 33201 - Posted: 11 Nov 2009, 0:25:10 UTC
Last modified: 11 Nov 2009, 0:25:28 UTC

Front Page Updates:


An Apology
November 10, 2009

We also really want to apologize for all the recent server issues and lost credit. Hopefully you'll all still be around when we get the server back up and work flowing again. I'll post more as soon as I know about hardware orders and what's going on.
--Travis



Server Crash - Part 6
November 10, 2009

In order to save you guys more lost credits, I don't think we'll be starting up new work until we have replacement hard drives. What I've gotten from labstaff is that the drives are running in degraded modes and hurting really bad. They're telling us the reason for the problems has been the construction around campus at RPI which has caused a lot of vibration in the computer labs which has wrecked quite a few hard drives. It seems we're not the only ones having similar issues. Hopefully we can have new hardrives in a day or two and get things back up and running.
--Travis


Server Crash - Part 5
November 10, 2009

We've restored the server from the last backup (which was this morning) so hopefully not too much credit has been lost. I still have to purge the database of all the workunits, unfortunately. We also need to order new hard drives for the server, so I'm not sure how stable things will be for the next week or so until we get them installed. But at least hopefully that explains the issues we've been having lately.
--Travis


Server Crash - Part 4
November 10, 2009

It looks like I'm going to have to remove all the workunits and results from the database. So if you have any running, feel free to cancel them.


Server Crash - Part 3
November 10, 2009

We have a backup from this morning, but it may have been taken after all the corruption. We're going to try it out and see if it helps anything.
--Travis


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Message 33228 - Posted: 12 Nov 2009, 7:30:32 UTC - in response to Message 33122.  
Last modified: 12 Nov 2009, 7:55:11 UTC

Cruncher's MW Concerns.

Lack of cached wu's on GPUs. With a wu taking 55 seconds or less, for my machine with 2 * GPUs in my quady, that gives me just under 15 minutes of wu's cached. Be nice to have 30 to 60 wu's cached per GPU.


Sadly this has been a problem with the project since it's inception. Due to what we're doing here our WUs need a somewhat faster turn around time, so chances are you're not going to be able to queue up too much work.

Also, with the server in it's current struggling state, letting people have more WUs in their queue only slows it down farther, so it's not something we can really change.


Well, on the first point, that doesn't entirely address the situation at hand. With the CPU renderer that can take 1.5 hours, 2 hours, or so a WU; that can take substantially less time on a GPU.... Fast turn around is one thing, but expecting results back every 30 seconds (12 second completion times) would hardly reduce the load on the servers. At least on the networking end, it would mean chatty boxes that are constantly hammering it with requests for new work, and constant uploads/reporting results. All these additional requests then have to be handled, and as they occur more often... In fact a larger queue for these people, with a slightly more aggressive backoff algorithm could help some types of resource load problems.

The problem is, that addressing it, would require 1. estimating a devices average completion time, and then 2. instead of restricting it by x number WUs (assuming all computing devices are equal), restrict it by y-time factor where faster devices can get a larger queue. Only problem that introduces is that if one's looking at a single BOINC client, it could pull both WUs for the CPU as well as the GPU, and if it comes up as a single computer ID that might get hairy for saying "OK, the number of GPU WUs allowed to be uncompleted at a time should be one thing, the number of CPU WUs that much smaller. Unless there's a way to distinguish between them from the scheduler's standpoint, which would require more info then a simple computer ID, with whatever benchmark stats got uploaded assuming one computation device of equal perf.

Allowing 30 minutes, or 1 hr of GPU tasks to exist on a box at a time, wouldn't delay return times greater then allowing one task to be completed on a CPU that takes longer then that to crunch, even exclusively. Also, the CPU can run a greater number of total projects (scheduled runtime), then projects that are GPU only. But it does add complexities to the mix; if one's goal is to get them in said reasonable time frame; when the WU completion time can very between seconds on the one hand, vs hours on the other. And both present rather different problems (results that aren't returned for days on the one hand, but on the other results getting reported so often with a constant stream of downloads, that the server's being practically hammered with constant uploads/downloads, and requests in unrelenting fashion).

There's almost a balance to be had between faster turn around (and the attendent faster WU generation) and server load issues that could be introduced if clients are having to contact it all the time, without some form of break before the next demand/request is placed upon the server via the network pipe, at least looking at the face of it. But with such a wild variation in completion times, and given a single box could have 1 of each device turning them in, meh... The single box would simply have no single constant wrt performance, due to the variation between the devices doing the tasks; even if the time to completion is what one really wants to get at, ignoring the differences in speed on varying devices which this introduces..
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Message 33242 - Posted: 13 Nov 2009, 5:36:21 UTC - in response to Message 33228.  
Last modified: 13 Nov 2009, 5:46:26 UTC

Cruncher's MW Concerns.

Lack of cached wu's on GPUs. With a wu taking 55 seconds or less, for my machine with 2 * GPUs in my quady, that gives me just under 15 minutes of wu's cached. Be nice to have 30 to 60 wu's cached per GPU.


Sadly this has been a problem with the project since it's inception. Due to what we're doing here our WUs need a somewhat faster turn around time, so chances are you're not going to be able to queue up too much work.

Also, with the server in it's current struggling state, letting people have more WUs in their queue only slows it down farther, so it's not something we can really change.


Well, on the first point, that doesn't entirely address the situation at hand. With the CPU renderer that can take 1.5 hours, 2 hours, or so a WU; that can take substantially less time on a GPU.... Fast turn around is one thing, but expecting results back every 30 seconds (12 second completion times) would hardly reduce the load on the servers. At least on the networking end, it would mean chatty boxes that are constantly hammering it with requests for new work, and constant uploads/reporting results. All these additional requests then have to be handled, and as they occur more often... In fact a larger queue for these people, with a slightly more aggressive backoff algorithm could help some types of resource load problems.

The problem is, that addressing it, would require 1. estimating a devices average completion time, and then 2. instead of restricting it by x number WUs (assuming all computing devices are equal), restrict it by y-time factor where faster devices can get a larger queue. Only problem that introduces is that if one's looking at a single BOINC client, it could pull both WUs for the CPU as well as the GPU, and if it comes up as a single computer ID that might get hairy for saying "OK, the number of GPU WUs allowed to be uncompleted at a time should be one thing, the number of CPU WUs that much smaller. Unless there's a way to distinguish between them from the scheduler's standpoint, which would require more info then a simple computer ID, with whatever benchmark stats got uploaded assuming one computation device of equal perf.

Allowing 30 minutes, or 1 hr of GPU tasks to exist on a box at a time, wouldn't delay return times greater then allowing one task to be completed on a CPU that takes longer then that to crunch, even exclusively. Also, the CPU can run a greater number of total projects (scheduled runtime), then projects that are GPU only. But it does add complexities to the mix; if one's goal is to get them in said reasonable time frame; when the WU completion time can very between seconds on the one hand, vs hours on the other. And both present rather different problems (results that aren't returned for days on the one hand, but on the other results getting reported so often with a constant stream of downloads, that the server's being practically hammered with constant uploads/downloads, and requests in unrelenting fashion).

There's almost a balance to be had between faster turn around (and the attendent faster WU generation) and server load issues that could be introduced if clients are having to contact it all the time, without some form of break before the next demand/request is placed upon the server via the network pipe, at least looking at the face of it. But with such a wild variation in completion times, and given a single box could have 1 of each device turning them in, meh... The single box would simply have no single constant wrt performance, due to the variation between the devices doing the tasks; even if the time to completion is what one really wants to get at, ignoring the differences in speed on varying devices which this introduces..


Yeah, what this dude said. I think someone's taking them for a ride with these "vibrating hard drives".....Seriously...construction??

2 servers, 1 for CPU tasks - 1 for GPU tasks...which are formulated differently to serve up the data to the project in the required times (as desired by the project_ - but keep everyone else happy with wu times, and reduce server load! (my suggestion would be no VM'ing them either - give them healthy CPU's and platforms to work with in addition to the suggestions above).

Crunchy crunchy, pair of dragons now...

4890 joined the fam with my unlocked 550BE
4870 downstairs on the 940 BE heating my living room.

Don't let Collatz get all the credits. Plus, I just got some dudes to join with some heavy hitting equiptment (295 and a 5870)...and then 2 days later we go for another huge outtage...

All my BOINC lobbying takes hits ...(I got tough skin, don't worry)

But RPI team still the best in the business!!

Such efficiency on these ATI cards are the envy of all the distributed computing projects....keep up the good work and thanks.

PS Good luck on your dissertation!
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Message 33361 - Posted: 19 Nov 2009, 19:57:20 UTC

I really don't know how the us mail works, but the hard disk here in Europe had arrived days ago. I am not in hurry of crunch MW, just ponder.
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Message 33362 - Posted: 19 Nov 2009, 20:19:02 UTC - in response to Message 33361.  

I really don't know how the us mail works, but the hard disk here in Europe had arrived days ago. I am not in hurry of crunch MW, just ponder.

The US postal service varies from great to not getting your mail. (as in never comes). I would bet the parts would come UPS or Fed-ex (both package delivery services, as USPS mainly delivers letters and envelopes)
Doesn't expecting the unexpected make the unexpected the expected?
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Message 33370 - Posted: 20 Nov 2009, 0:25:42 UTC - in response to Message 33361.  

I really don't know how the us mail works, but the hard disk here in Europe had arrived days ago. I am not in hurry of crunch MW, just ponder.


The hard drives are here, they just need to be installed. I'm going to bug labstaff tomorrow to hopefully get things working again.
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Message 33373 - Posted: 20 Nov 2009, 2:33:31 UTC

That you Travis:)

I am having MW withdrawals.

And its getting to be painful:)

Any way, thank you for the update.

Dan
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