No problem running with windows 10 have been running V8.8 for past hour.

First four returned with 30 spikes.

---

A computer program will always do what you tell it to do, but rarely what you want it to do.

What's the problem! Windows 10?

Or possibly anti-virus.

What does the extended log (<http_debug>) say?

It's very likely. I use avast. Where is extended log?

Now new Windows 10 Insider Preview update began (build 11082). So I go to bed. See you later...

---

Luckiest in the world. WMD = Weapon of Mass Distraction

setiathome_8.00_windows_intelx86.exe
size=2974730
md5=35aa1693267941c7cc4ded47e8ada895
sha256=c3d4fe387090ed95f18b14cc074ed46c5037926a379765e073387b20907faa73

BOINC client failed to download s@h v8 client again! s@h v8 is now 2118kb!
Workunits are fine. My BOINC is version 7.6.9. What's the problem! Windows 10?

---

setiathome_8.00_windows_intelx86.exe
size=2974730
md5=35aa1693267941c7cc4ded47e8ada895
sha256=c3d4fe387090ed95f18b14cc074ed46c5037926a379765e073387b20907faa73

BOINC client failed to download s@h v8 client again! s@h v8 is now 2118kb!
Workunits are fine. My BOINC is version 7.6.9. What's the problem! Windows 10?

Oh, 8.00 began to calculate!
Thank you Eric. It's so small compared with 7.99. But a bit smaller..?

Thank you very much.

New version of Windows 10 began to install.

---

Luckiest in the world. WMD = Weapon of Mass Distraction

Could be an antivirus issue. "Rising" antivirus reports everything compiled under MinGW32 to be "Generic Malware"

---

It's very likely. I use avast.

I've had problems with Avast sometimes, but my test machine copy has let it through (Windows XP). If it fails, disabling shields for 10 minutes and re-trying the work fetch is usually enough.

Where is extended log?

I meant BOINC's Event Log. With v7.6.9, use Ctrl-Shift-F to set options, and Ctrl-Shift-E to view the result. But it sounds like it won't be needed.

The size is ok. So I hope it will resume computing. Now it stopped. I cannot restart this computer because Windows 10 upgrading is going....

Thank you all. Good night.

regards,

---

Luckiest in the world. WMD = Weapon of Mass Distraction

Thanks all.

My s@h 8.00 is running. I couldn't sleep with s@h v8 incident and windows 10 update on two machines.

---

Luckiest in the world. WMD = Weapon of Mass Distraction

It's very likely. I use avast.

I've had problems with Avast sometimes, but my test machine copy has let it through (Windows XP). If it fails, disabling shields for 10 minutes and re-trying the work fetch is usually enough.

Where is extended log?

I meant BOINC's Event Log. With v7.6.9, use Ctrl-Shift-F to set options, and Ctrl-Shift-E to view the result. But it sounds like it won't be needed.

I use avast also, I exclude the location where the Boinc files reside at, then Avast and Boinc get along fine.

It's now under Active Protection in Avast, click there, then under Exclusions, then add the folders that you want excluded from being scanned and you're done.

Seems to be a significant performance difference between i686-pc-linux-gnu and x86_64-pc-linux-gnu for similar ARs on my T7400. Is that to be expected?

Task 21399471 : i686-pc-linux-gnu

Run time:	2 hours 25 min 33 sec
CPU time:	2 hours 24 min 37 sec
WU true angle range is :  2.597554
                v_BaseLineSmooth (no other)
     v_vGetPowerSpectrumUnrolled 0.000077 0.00000 
              sse2_ChirpData_ak8 0.012603 0.00000 
                   v_vTranspose4 0.011484 0.00000 
                  AK SSE folding 0.001085 0.00000 
Flopcounter: 16177346373853.390625

Task 21399550 : x86_64-pc-linux-gnu

Run time	3 hours 53 min 34 sec
CPU time	3 hours 51 min 34 sec
WU true angle range is :  2.724047
                v_BaseLineSmooth (no other)
    v_vGetPowerSpectrumUnrolled2 0.000672 0.00000 
              sse3_ChirpData_ak8 0.044506 0.00000 
                   v_vTranspose4 0.014768 0.00000 
                  AK SSE folding 0.002353 0.00000 
Flopcounter: 16155512655172.181641

x86
AK SSE folding 0.001085 0.00000
x64
AK SSE folding 0.002353 0.00000
[/pre]

That's definitely wrong state.
Either embedded benchmark screwed and can't be count as representative to function speed or we get wrong machine instructions from SIMD intrinsics in case of x64 build.
Combined with precision issues I would recommend to check x64 build disassembly.

---

News about SETI opt app releases: https://twitter.com/Raistmer

Seems to be a significant performance difference between i686-pc-linux-gnu and x86_64-pc-linux-gnu for similar ARs on my T7400. Is that to be expected?

Task 21399471 : i686-pc-linux-gnu

Run time:	2 hours 25 min 33 sec
CPU time:	2 hours 24 min 37 sec
WU true angle range is :  2.597554
                v_BaseLineSmooth (no other)
     v_vGetPowerSpectrumUnrolled 0.000077 0.00000 
              sse2_ChirpData_ak8 0.012603 0.00000 
                   v_vTranspose4 0.011484 0.00000 
                  AK SSE folding 0.001085 0.00000 
Flopcounter: 16177346373853.390625

i686-pc app uses fftw 3.3.3 and knows about SSE2:

(fftw-3.3.3 fftwf_wisdom #x08ac4c16 #x457005cc #xea102cf7 #xd7ff9038
(fftwf_rdft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x00b20725 #xfe2286c5 #x99047c24 #x07cb8d59)
(fftwf_codelet_t3bv_4_sse2 0 #x11bdd #x11bdd #x0 #x4ce9e131 #xa54231c3 #x8b7f2cf1 #x04b781a5)
(fftwf_codelet_t2bv_64_sse2 0 #x11bdd #x11bdd #x0 #x4f68a083 #x18c4835c #xef257bbc #xc84a4e9c)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x603f4d33 #xb90ac208 #x32427a49 #xd0e486fa)
(fftwf_codelet_n2bv_16_sse2 0 #x11bdd #x11bdd #x0 #x182c16f4 #x80e80192 #x06497413 #xe8f9accb)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x74bd97ac #xc5b251a4 #x886c12c7 #xe354c952)
(fftwf_codelet_r2cf_64 0 #x11bdd #x11bdd #x0 #x9d75d2bf #x7f5f2a0c #x2dff2a21 #xef5d11be)
(fftwf_codelet_t2bv_64_sse2 0 #x11bdd #x11bdd #x0 #xda86ff9a #xd19408ac #x4c8b1d29 #x34fe7137)
(fftwf_reodft010e_r2hc_register 0 #x113c5 #x11bdd #x0 #x3f656c48 #x724e1d4c #x4cae1a6c #x04328e7d)
(fftwf_codelet_n1bv_128_sse2 0 #x11bdd #x11bdd #x0 #xe4514a64 #x4ee6955f #x7893dea4 #xd9ccb16d)
(fftwf_codelet_n1bv_16_sse2 0 #x11bdd #x11bdd #x0 #x34bded3b #x4743dc49 #x3288ba8e #x4f339047)
(fftwf_codelet_hf_64 0 #x11bcd #x11bdd #x0 #x4b7606fc #x09d8ba9e #x61657d88 #xa7719fef)
(fftwf_codelet_n2bv_32_sse2 0 #x11bdd #x11bdd #x0 #x6a4dfdef #x59ef7143 #xac30ce37 #x394d99bb)
(fftwf_codelet_r2cf_32 0 #x11bdd #x11bdd #x0 #x5b844cea #x2a920b74 #xf82a54aa #xee1bc380)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x454d3885 #xc0b7c84f #x00ebd582 #x2a3e261a)
(fftwf_codelet_n2bv_16_sse2 0 #x11bdd #x11bdd #x0 #xbc8b30c7 #x28ab49b7 #x3f56794a #x2a9d0b05)
(fftwf_codelet_n1_8 0 #x11bdd #x11bdd #x0 #x9189af87 #x091b3ed7 #x9c83961b #x2689f5db)
(fftwf_codelet_t2bv_64_sse2 0 #x11bdd #x11bdd #x0 #x686ea4c9 #xceee15c9 #x6a91b1b5 #x580f4f5c)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x2a9ff22c #xa449fa4e #xde434efa #x2ae642fd)
(fftwf_codelet_r2cfII_64 0 #x11bdd #x11bdd #x0 #x4cac8088 #x8fcf5fdd #x58ff6170 #xa5681aee)
(fftwf_codelet_n1bv_32_sse2 0 #x11bdd #x11bdd #x0 #xb379e90d #x1b1380a1 #x6adf9497 #x6843e816)
(fftwf_codelet_t3bv_8_sse2 0 #x11bdd #x11bdd #x0 #x0d5eb0f4 #x0cf29d07 #x7ccd6128 #xe9af99eb)
(fftwf_codelet_t2bv_32_sse2 0 #x11bdd #x11bdd #x0 #x7da1e8e3 #xbe7f8c2c #x3531ed91 #xc6e21ba2)
(fftwf_codelet_t1bv_4_sse2 0 #x11bdd #x11bdd #x0 #x23c47a99 #xfecbf0e9 #xa3be8b85 #x32edd60a)
(fftwf_codelet_n2bv_16_sse2 0 #x11bdd #x11bdd #x0 #x263ac2ee #x87254b25 #x62ea94d5 #x9880b54e)
(fftwf_codelet_n1bv_64_sse2 0 #x11bdd #x11bdd #x0 #x1b1168b8 #xa257a795 #x0440a74f #xf2a8d3db)
(fftwf_codelet_t2bv_64_sse2 0 #x11bdd #x11bdd #x0 #xb8964bc9 #x77cb40ab #xa22d9de7 #x24274f6d)
(fftwf_codelet_t2bv_4_sse2 0 #x11bdd #x11bdd #x0 #x14163691 #x0ee795a8 #x5f6487bb #x47b7ad17)
(fftwf_codelet_n1bv_32_sse2 0 #x11bdd #x11bdd #x0 #x5cbd0179 #xc6a1cc77 #x6e06f5b7 #x8d222380)
(fftwf_codelet_t2bv_4_sse2 0 #x11bdd #x11bdd #x0 #x91c47bfb #x7bb83b5e #x417ef904 #x10342406)
(fftwf_codelet_t2bv_16_sse2 0 #x11bdd #x11bdd #x0 #x8a2f4f6f #xf1259a8c #x4f6913c8 #xd0b630ce)
(fftwf_codelet_r2cf_64 1 #x11bdd #x11bdd #x0 #x4f90de00 #x5e34ff7f #xc1f004e0 #x191ebec9)
(fftwf_codelet_t1bv_32_sse2 0 #x11bdd #x11bdd #x0 #xb3e23be7 #x5d5cca12 #x8698e891 #x562df0ef)
(fftwf_codelet_n2bv_16_sse2 0 #x11bdd #x11bdd #x0 #x9a38e34e #xfad8228e #xbb7a5df2 #x32087521)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x15dae81f #x80aab05f #xc35f688c #x30bdb696)
(fftwf_codelet_n2bv_64_sse2 0 #x11bdd #x11bdd #x0 #xb293c469 #x9bf15bad #x2c9fd420 #x63263eaf)
(fftwf_codelet_hf_32 0 #x11bcd #x11bdd #x0 #xc6ec8db1 #xc662d138 #x8fb51dbb #xeb99e443)
(fftwf_codelet_t1bv_64_sse2 0 #x11bdd #x11bdd #x0 #xafcbae12 #xe7188323 #xff49056a #x06881a92)
(fftwf_codelet_t1bv_64_sse2 0 #x11bdd #x11bdd #x0 #x880fef06 #x6885e105 #x8eed29c7 #xc6cf2772)
(fftwf_codelet_t2bv_16_sse2 0 #x11bdd #x11bdd #x0 #xac79e5c1 #xf99ecd88 #xcff2c8e0 #x6bcf98ed)
(fftwf_codelet_t2bv_2_sse2 0 #x11bdd #x11bdd #x0 #xe7288594 #xa53b1379 #xc1ea7b45 #xe2150d3e)
(fftwf_codelet_n1bv_128_sse2 0 #x11bdd #x11bdd #x0 #x6bae0cc1 #xcb40e97c #x7ea2e675 #xc8525157)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x6a53f9be #xb923176e #xf0eece98 #x8574b673)
(fftwf_codelet_r2cfII_32 0 #x11bdd #x11bdd #x0 #x7ef04cb6 #x382f909b #x68cbfeb0 #xdf48f380)
(fftwf_codelet_t2bv_2_sse2 0 #x11bdd #x11bdd #x0 #x6a86aedb #x4bc9c476 #x79079e3c #xd43bad24)
(fftwf_codelet_t2bv_4_sse2 0 #x11bdd #x11bdd #x0 #x187477e8 #x91fece47 #xe5d3dd56 #x25409b1f)
(fftwf_codelet_t2bv_64_sse2 0 #x11bdd #x11bdd #x0 #x8d0b54ff #xad874198 #xf537689a #x3ec5c294)
(fftwf_codelet_n2bv_32_sse2 0 #x11bdd #x11bdd #x0 #x20b703af #xff2e5271 #x6e3f1a59 #x8d750863)
(fftwf_codelet_n2bv_64_sse2 0 #x11bdd #x11bdd #x0 #xd13ec3a7 #x81bed84d #xfdcd7021 #x69e88846)
)

Task 21399550 : x86_64-pc-linux-gnu

Run time	3 hours 53 min 34 sec
CPU time	3 hours 51 min 34 sec
WU true angle range is :  2.724047
                v_BaseLineSmooth (no other)
    v_vGetPowerSpectrumUnrolled2 0.000672 0.00000 
              sse3_ChirpData_ak8 0.044506 0.00000 
                   v_vTranspose4 0.014768 0.00000 
                  AK SSE folding 0.002353 0.00000 
Flopcounter: 16155512655172.181641

x86_64 app uses fftw 3.2.1 and doesn't know about SSE2, let alone AVX:

(fftw-3.2.1 fftwf_wisdom
(fftwf_codelet_t1_64 0 #x11bdd #x11bdd #x0 #x6023d2c8 #xd880a372 #xfe5a8354 #x14b8d4aa)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #xf48ecb35 #xfec3abb7 #x4760f707 #x756208ff)
(fftwf_codelet_n1_64 0 #x11fdd #x11fdd #x0 #x875bec7f #xdf7c30d3 #xebe45c1f #x84e73cd7)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x1ecf02de #xa74e9369 #xaee47b35 #x1f34f24a)
(fftwf_codelet_q1_8 0 #x11fdd #x11fdd #x0 #x403a3ec4 #xcf7c7747 #x6c598325 #xd55d1f19)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x078caca3 #x1ecb4db9 #x7b242b57 #x0fdc1638)
(fftwf_codelet_n1_64 0 #x11bdd #x11bdd #x0 #x4ee35940 #x6634b6b2 #xae0bcb30 #x95a909b7)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #xb9ab3b4a #x8d94586c #x9b1c0f52 #x33bdeb32)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #xb3d76b03 #x0e4c780f #x9a903cb6 #xbece216d)
(fftwf_codelet_r2cf_64 0 #x11bdd #x11bdd #x0 #x6d656ee6 #x53393ec8 #xfa8dd6e0 #x15e5d458)
(fftwf_rdft_rank0_register 2 #x11bdd #x11bdd #x0 #xcd79a8cb #x2f4c5db4 #x72de4f6d #xceefe7a9)
(fftwf_codelet_n1_16 0 #x11bdd #x11bdd #x0 #xe624c5b3 #xa8b4f2cb #x569a81db #x385eade0)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x5f087fa7 #x858e6d06 #xcc4fc473 #x2dec7f69)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x3cd89074 #x65172509 #x416cd8e1 #x41b5f68c)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #xf8d7ed02 #xd1b5b947 #x43a2ee6e #x9ec0b6b5)
(fftwf_dft_vrank_geq1_register 0 #x11fdd #x11fdd #x0 #xe8fd7d68 #x530bb7d0 #x2c5d8b88 #x20297bd5)
(fftwf_codelet_r2cfII_32 0 #x11bdd #x11bdd #x0 #xfd958223 #x4fcd2440 #x54c48ff5 #xe150f643)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #x1ed069aa #x4cdf0b81 #xaba11f5d #x9e76b43f)
(fftwf_codelet_t1_32 0 #x11bdd #x11bdd #x0 #x59d2ffe9 #x583e2319 #x83185321 #x30e6e2c0)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #xa6428d25 #xac44c8be #x3f347055 #xca12ef99)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #x17fdbbb8 #x663c2c9b #xe563b4fd #x400e7ec2)
(fftwf_codelet_hf_64 1 #x11bcd #x11bdd #x0 #xd7ba8a81 #x269d1e2f #x8c825f0b #x2f53c532)
(fftwf_codelet_t1_32 0 #x11bdd #x11bdd #x0 #x29e3e9e0 #x4513f9fa #xe3c447e2 #x939e6d81)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #x663821e0 #x5bf52635 #xd4c10e39 #xc76d8e73)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #xbd657f39 #x0b21c23c #x82f8444f #xce513432)
(fftwf_dft_vrank_geq1_register 0 #x11fdd #x11fdd #x0 #x5c18db91 #x24b9221a #xbe92c18a #xc63f02ef)
(fftwf_codelet_n1_16 0 #x11bdd #x11bdd #x0 #x0fc2ef58 #x9f0dfe15 #x3b8cb54b #xe03075f2)
(fftwf_codelet_r2cfII_64 0 #x11bdd #x11bdd #x0 #xbbbede56 #x008850ac #xd8a24bee #xd88e05c3)
(fftwf_codelet_t1_16 0 #x11bdd #x11bdd #x0 #xe66c09b6 #xb29f4cfd #x053aeada #x08a8cff4)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #x313c67b4 #xf9650cb7 #xb240ca00 #xa8787bde)
(fftwf_codelet_n1_64 0 #x11bdd #x11bdd #x0 #x637f8caf #x8a6434a5 #x56b2c119 #x758da1c5)
(fftwf_dft_indirect_register 0 #x11bdd #x11bdd #x0 #x14bc7afc #x7f39c9eb #x9e64c78a #xf459b0ca)
(fftwf_dft_r2hc_register 0 #x11bdd #x11bdd #x0 #x479d5001 #xc4a2114f #x83a71129 #x818c5e1b)
(fftwf_codelet_t1_16 0 #x11bdd #x11bdd #x0 #x7f5fc40c #x0fca4ec1 #x4f8aac1c #x2b200d17)
(fftwf_reodft010e_r2hc_register 0 #x113c5 #x11bdd #x0 #x08507b7c #x13b10359 #x869608d2 #xc719a48b)
(fftwf_codelet_t1_4 0 #x11bdd #x11bdd #x0 #x2f4e21cd #xf66314f9 #x675ef133 #x56894bfd)
(fftwf_codelet_n1_64 0 #x11bdd #x11bdd #x0 #x08499c22 #xede5a7e0 #x9bccb22e #xdd2540dc)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #x18a9d085 #x3cf521db #x7170ecd6 #x8b5afcc9)
(fftwf_codelet_t2_8 0 #x11bdd #x11bdd #x0 #xd7705e5e #xf5dbff13 #x38e95fae #x88884d62)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #x06ae9a08 #xf5fd8c34 #xcacd2227 #xc46ddcfa)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x2be7b553 #x12163c4a #x78c79d4e #x937a9c15)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #xd2e52783 #xcfe12f3b #xb3f05fc8 #xa940baff)
(fftwf_rdft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x6f391ea1 #xf6b1cc12 #x4a05e243 #x8dfaa129)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #xc206bf72 #xc2e54813 #xe4607849 #x0f9a2815)
(fftwf_codelet_r2cf_32 0 #x11bdd #x11bdd #x0 #x1a689b9e #xca8b24d5 #x734a8afd #x606d5286)
(fftwf_codelet_n1_32 0 #x11bdd #x11bdd #x0 #x67107505 #xfbbf57ce #xff764e9b #xf0c1439c)
(fftwf_codelet_hf_32 0 #x11bcd #x11bdd #x0 #xdae2400d #x25a291d8 #x9b06ff05 #xda505df7)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x7f4f0d3b #x0cf78dce #xe00ad598 #x29507838)
(fftwf_codelet_n1_8 0 #x11bdd #x11bdd #x0 #x0e177c77 #x9d967bab #xa4ff5808 #x02f451ad)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #x3a0f32b3 #xe9c82fbf #x787be3e4 #x69b64963)
(fftwf_codelet_t1_64 0 #x11bdd #x11bdd #x0 #x3182f4fb #x0a5541af #xd1943d43 #x87c40628)
(fftwf_codelet_t1_16 0 #x11bdd #x11bdd #x0 #x957ed72a #x2b707b45 #xd6b45a08 #xd51fff31)
(fftwf_codelet_n1_64 0 #x11bdd #x11bdd #x0 #x3ff95f1a #x09e505fc #xbe0e560a #x42c286d7)
(fftwf_codelet_r2cf_64 1 #x11bdd #x11bdd #x0 #x88a820ec #x0d7b375a #x138fbac4 #xde79be2b)
(fftwf_codelet_t1_4 0 #x11bdd #x11bdd #x0 #xa3764e88 #xc2c7a39e #xa4daad0f #x7145bd64)
(fftwf_codelet_t1_8 0 #x11fdd #x11fdd #x0 #xd676d958 #x75f15a4b #xd65df885 #xdce3b85b)
(fftwf_codelet_t1_8 0 #x11bdd #x11bdd #x0 #x207cfb70 #xe1be1e10 #xb134532a #x3f25117e)
(fftwf_dft_vrank_geq1_register 0 #x11bdd #x11bdd #x0 #x26f1c781 #x287c522b #xa03555de #x8d567019)

Claggy

Yes, it can affect total run times, but FOLDING function doesn't contain FFTW calls still experienced 2 times difference of speed inside benchmark !
That's strange!

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News about SETI opt app releases: https://twitter.com/Raistmer

No problems, works like a charm:

Q8200:
http://setiweb.ssl.berkeley.edu/beta/results.php?hostid=57178&offset=0&show_names=0&state=4&appid=38

Old Celeron(R) M processor 1.50GHz:
http://setiweb.ssl.berkeley.edu/beta/results.php?hostid=57183&offset=0&show_names=0&state=4&appid=38

I don't see a significant difference in either disassembly. The interleaved non-sse code is the different, but the sse code is virtually identical.

The timers compiled for each report nearly identical results on the same machine.

/home/korpela/build/x86_64-linux/seti_boinc/client> ./hires_timer_test  && ~/build/i686-linux/seti_boinc/client/hires_timer_test 
frequency:3000127293.000000 resolution:0.000001 seconds:3277133.727820
0.000115 elapsed
frequency:3000127248.000000 resolution:0.000001 seconds:3277135.776963
0.000132 elapsed

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I may have an idea... The x86_64 code was compiled with -mfp-math=sse whereas the i686 code uses x87 math. That could mean that non-SIMD math is bumping into SIMD math causing more spills and leaving fewer FP registers available.

I have no evidence for this, and it's not apparent from the disassembly. I suppose I could compile for both and see if there is a difference.

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I had quite a few of both Linux flavors run overnight, with similar performance differences to those I originally reported. If it will help, here are the folding timings from the last 5 completed tasks for each, all with exactly the same AR of 2.724696. The results seem to be fairly consistent.

x86_64-pc-linux-gnu
Task 21408298 (RT 3:34:42): AK SSE folding 0.002342 0.00000
Task 21407804 (RT 3:32:24): AK SSE folding 0.002356 0.00000
Task 21407806 (RT 3:30:55): AK SSE folding 0.002339 0.00000
Task 21407595 (RT 3:32:12): AK SSE folding 0.002419 0.00000
Task 21407713 (RT 3:28:31): AK SSE folding 0.002453 0.00000

i686-pc-linux-gnu
Task 21407583 (RT 1:55:36): AK SSE folding 0.000577 0.00000
Task 21407135 (RT 2:10:11): AK SSE folding 0.000577 0.00000
Task 21407158 (RT 2:08:21): AK SSE folding 0.000594 0.00000
Task 21406949 (RT 2:12:14): AK SSE folding 0.000602 0.00000
Task 21406410 (RT 2:03:59): AK SSE folding 0.000568 0.00000

Good! Results consistence leaves out just random fluctuation with let say context switches exactly while benchmark goes and so on.
The difference is real.

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News about SETI opt app releases: https://twitter.com/Raistmer

I had quite a few of both Linux flavors run overnight, with similar performance differences to those I originally reported. If it will help, here are the folding timings from the last 5 completed tasks for each, all with exactly the same AR of 2.724696. The results seem to be fairly consistent.

x86_64-pc-linux-gnu
Task 21408298 (RT 3:34:42): AK SSE folding 0.002342 0.00000
Task 21407804 (RT 3:32:24): AK SSE folding 0.002356 0.00000
Task 21407806 (RT 3:30:55): AK SSE folding 0.002339 0.00000
Task 21407595 (RT 3:32:12): AK SSE folding 0.002419 0.00000
Task 21407713 (RT 3:28:31): AK SSE folding 0.002453 0.00000

i686-pc-linux-gnu
Task 21407583 (RT 1:55:36): AK SSE folding 0.000577 0.00000
Task 21407135 (RT 2:10:11): AK SSE folding 0.000577 0.00000
Task 21407158 (RT 2:08:21): AK SSE folding 0.000594 0.00000
Task 21406949 (RT 2:12:14): AK SSE folding 0.000602 0.00000
Task 21406410 (RT 2:03:59): AK SSE folding 0.000568 0.00000

Another function we currently hunting for is vChirp and its derivatives.
Good to get statistics on it how often and what kind get selection on particular host x86 vs x64.
vChirp can lead not only to speed variation but to inconclusives as well.

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News about SETI opt app releases: https://twitter.com/Raistmer