Message boards :
Number crunching :
Macintel and OS X performance issue
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Author | Message |
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Send message Joined: 31 Mar 08 Posts: 23 Credit: 721,836 RAC: 0 |
I've started crunching couple of days ago and I've been quite surprised to see the following results with my machines per WU: Mini 2.0 ghz (T7200) Mac OS 10.5 : 15 min 20 s Mac Pro 2.66 Mac OS 10.5 : 11 min 29 s Pentium IV 3 Ghz HT Win XP Pro: 11 min 44s Dell Latitude 2 Ghz (T7200) Xp Pro 09 min 46 s Comparing the first and last (same CPU), we have a -33% performance difference for the very same CPU under Mac OS 10.5. Another Mac user gave similar results: mini CD 2,16Ghz 11min 20s (100%) mini C2D 2Ghz 15min 15s (70%) These were posted in the macbidouille forum (French Hardmac) http://forum.macbidouille.com/index.php?s=649f1672761587c8ee0b3d72939f502f&showtopic=248789&st=270 Anyone with similar issues ? That is quite disapointing at the eve of a Raid, looks like Mac Intel users are going to run with a chain on their feet... |
Send message Joined: 30 Aug 07 Posts: 2046 Credit: 26,480 RAC: 0 |
I've started crunching couple of days ago and I've been quite surprised to see the following results with my machines per WU: in the last version of the application we did a lot of optimizations to the non-intel macs, so thats probably the reason you're seeing the difference in speed. we're working on re-compiling for intel macs to speed everything up. |
Send message Joined: 26 Dec 07 Posts: 41 Credit: 2,582,082 RAC: 0 |
in the last version of the application we did a lot of optimizations to the non-intel macs, You did? On my G5 PPC, app 1.21 is taking exactly the same time per task as app 1.13 did. |
Send message Joined: 30 Aug 07 Posts: 2046 Credit: 26,480 RAC: 0 |
in the last version of the application we did a lot of optimizations to the non-intel macs, well, we updated everything non-mac i guess ;) i thought the PPC macs were optimized but i guess not. this is pretty high on our to-do list. we'd like to have macs inline with windows/linux. before the optimizations i think the macs were the fastest. |
Send message Joined: 31 Mar 08 Posts: 23 Credit: 721,836 RAC: 0 |
Hi Travis, Thanks for your reply. If you have a look at other projects, you'll see that this is definitely worth it: G5 bi-pro and Mac Pro are quite common in the top 20 crunching machines, quite amazing taking into account the Apple market share. I do not such OS/Cpu combination in MW stats, thus IMHO, it deserves the pretty high priority on your to-do list. ;-) |
Send message Joined: 8 Oct 07 Posts: 289 Credit: 3,690,838 RAC: 0 |
It may be due to the Mac's crunching abilities....but I'm thinking it has more to do with fairness to all participants as far as urgency :) |
Send message Joined: 31 Mar 08 Posts: 23 Credit: 721,836 RAC: 0 |
:-) Right but project interest and fairness to participants are not incompatible at all. It is about combining the pleasure of participating to a scientific project and the fun (something childish, but I'm a big child eventually) of participating to a competition. ;-))) If you're looking for volunteers to test some alpha/beta Macintel versions, do not hesitate... |
Send message Joined: 30 Aug 07 Posts: 2046 Credit: 26,480 RAC: 0 |
well, it's also sort of personal. both my machines are macs :D dave uses one as well. we just need to dig a bit farther into xcode and get it to use the same optimization flags we used on the other versions. |
Send message Joined: 31 Mar 08 Posts: 23 Credit: 721,836 RAC: 0 |
Okido, in the meantime, I put all my machines (PC and Macs) 99% on MW for the Alliance Francophone Raid. Thanks ! |
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