对FAH的一个疑问

Julian_Yuen

妈妈说了，不要跟有钱的孩子攀比....囧

sakeki

真想弄块 HD 3650来算算啊，￥499 大洋

宝康

这是2600xt的log，cpu与显卡都没超频，看的出来，比3870还是差了不少
起码时间上长了很多，大约2小时40分一个wu...

[22:31:14] - Preparing to get new work unit...
[22:31:14] + Attempting to get work packet
[22:31:14] - Connecting to assignment server
[22:31:15] - Successful: assigned to (171.64.65.103).
[22:31:15] + News From Folding@Home: GPU folding beta
[22:31:15] Loaded queue successfully.
[22:31:16] + Closed connections
[22:31:16]
[22:31:16] + Processing work unit
[22:31:16] Core required: FahCore_11.exe
[22:31:16] Core found.
[22:31:16] Working on Unit 04 [April 15 22:31:16]
[22:31:16] + Working ...
[22:31:16]
[22:31:16] *------------------------------*
[22:31:16] Folding@Home GPU Core - Beta
[22:31:16] Version 1.00 (Fri Nov 2 13:40:51 PDT 2007)
[22:31:16]
[22:31:16] Compiler  : Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 14.00.50727.42 for 80x86
[22:31:16] Build host: Host
[22:31:16] Preparing to commence simulation
[22:31:16] - Looking at optimizations...
[22:31:16] - Created dyn
[22:31:16] - Files status OK
[22:31:16] - Expanded 46036 -> 246512 (decompressed 535.4 percent)
[22:31:16] Called DecompressByteArray: compressed_data_size=46036 data_size=246512, decompressed_data_size=246512 diff=0
[22:31:16] - Digital signature verified
[22:31:16]
[22:31:16] Project: 2799 (Run 1, Clone 72, Gen 23)
[22:31:16]
[22:31:16] Assembly optimizations on if available.
[22:31:16] Entering M.D.
[22:31:23] Working on 582 p2799_N68H_AM03
[22:31:23] Starting GUI Server
[22:33:06] Completed 1%
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[01:11:49] Completed 100%
[01:12:49]
[01:12:49] Finished Work Unit:
[01:12:49] - Reading up to 1434888 from "work/wudata_04.trr": Read 1434888
[01:12:49] trr file hash check passed.
[01:12:49] - Reading up to 457208 from "work/wudata_04.xtc": Read 457208
[01:12:49] xtc file hash check passed.
[01:12:49] edr file hash check passed.
[01:12:49] logfile size: 92725
[01:12:49] Leaving Run
[01:12:52] - Writing 1985893 bytes of core data to disk...
[01:12:52] Done: 1985381 -> 1805079 (compressed to 90.9 percent)
[01:12:52]   ... Done.
[01:12:52] - Shutting down core
[01:12:52]
[01:12:52] Folding@home Core Shutdown: FINISHED_UNIT
[01:12:55] CoreStatus = 64 (100)
[01:12:55] Sending work to server

shouldbe

原帖由 PAGAN 于 2008-4-15 16:56 发表
最近刚买了部PS3，说实话最想“玩”的就是FAH@PS3哈哈～ 于是有机会比较了三个平台的FAH计算速度：

PS3 FAH的速度是0.15帧/秒，三个多小时完成一个工作单元；

E4300oc2.7GHz with X1950Pro GPU计算， CPU一个核心满载， 1%需要8 ...

你这个比较是错误的。因为WU有上百种。每个WU的计算量都是不一样的。拿不同的WU的计算时间比较根本就没有意义。就好比一个WU是在CPU上算的。计算量100。耗时10小时。PS3上的WU的计算量是50。耗时4小时。你不能说前者的速度是后者的40％。实际上前者速度是后者的83％！只是举个例子。实际上两者的计算能力很难比较。另外两者的计算方法和结果也都有很大差别。这更加大了比较的难度。

曾经想是否PPD可以是比较的基准。但实际上也不可行。因为FAH项目组在考虑分数的时候不是线性的。而是有某种“倾向性”的（我用1950GT GPU算过后的感觉，因为1950GT的PPD比E4400还低）。GPU号称处理能力是CPU的几十倍。但实际上没有一个GPU的PPD能超过“相似”的CPU（同样的道理，没有办法比较，所以打引号，表示是感觉上相似。比如Q6600和1950GT）的几倍的。

shouldbe

原帖由 Julian_Yuen 于 2008-4-16 00:17 发表
妈妈说了，不要跟有钱的孩子攀比....囧

从头像和名字来看，你好像就是那个妈妈。养孩子的自然不要和单身贵族比。

sakeki

就算实际处理能力GPU高CPU很多倍，但分数不会是同样的比例，如果那样，CPU客户端肯定跑光，N个CPU算还不如一块显卡多分。

shouldbe

你这话太对了。我是算分狂人。CPU算分多，相对来说省电（如果显卡支持动态调整功率的话），所以我选择了CPU。