I figured out the unexpected PCIe bandwidth usage/poor performance on slower slots.

[url]http://www.mersenneforum.org/showpost.php?p=420850&postcount=37[/url]

I'm not sure if this was oversight or some rationale for using host memory I wasn't aware of. Changing the buffer types to GPU memory and updating mfakto across my systems made a significant (19.4%) increase in overall throughput.

It is possible some of the other benchmarks/performance of parameters or kernel selection may not compare the same once bus bandwidth is removed as a bottle neck.

[QUOTE=airsquirrels;420884]I figured out the unexpected PCIe bandwidth usage/poor performance on slower slots.

[URL]http://www.mersenneforum.org/showpost.php?p=420850&postcount=37[/URL]

I'm not sure if this was oversight or some rationale for using host memory I wasn't aware of. Changing the buffer types to GPU memory and updating mfakto across my systems made a significant (19.4%) increase in overall throughput.

It is possible some of the other benchmarks/performance of parameters or kernel selection may not compare the same once bus bandwidth is removed as a bottle neck.[/QUOTE]
Bravisimo! :grin: I am purely nvidia, but I am delighted at such discoveries on whatever front. :smile:

i have a question
what are the optimal settings for a R9 390X (Hawaii XT) ?
i played around with some different settings
but i can not reach 880 GHz-days (source: mersenne.ca)
only about 600 GHz-days
i do tf exponents around 200 millions - bitlevel 67 to 76 running windows x64

[QUOTE=lalera;423552]i have a question
what are the optimal settings for a R9 390X (Hawaii XT) ?
i played around with some different settings
but i can not reach 880 GHz-days (source: mersenne.ca)
only about 600 GHz-days
i do tf exponents around 200 millions - bitlevel 67 to 76 running windows x64[/QUOTE]

Hi :smile:

The throughput of a factoring program often depends on the chosen range: higher (> 150M) and lower (<1M) exponents usually perform worse and give a lower throughput.

Luigi

[QUOTE=ET_;423596]Hi :smile:

The throughput of a factoring program often depends on the chosen range: higher (> 150M) and lower (<1M) exponents usually perform worse and give a lower throughput.

Luigi[/QUOTE]

thank you !

can do somebody please make a binary of mfakto v0.14 for windows x64
with the modifications of airsquirrels ?

[QUOTE=lalera;423716]can do somebody please make a binary of mfakto v0.14 for windows x64
with the modifications of airsquirrels ?[/QUOTE]

.

Great work! :tu:

For some reason, though, when I extracted the [B]mfakto.ini[/B] file, there seemed to be no carriage returns . :unsure:

Rodrigo

Notepad++ is a handy tool. It recognizes returns of all types. :smile:

[QUOTE=kracker;423772].[/QUOTE]

thank you very much !

[QUOTE=Rodrigo;423820]Great work! :tu:

For some reason, though, when I extracted the [B]mfakto.ini[/B] file, there seemed to be no carriage returns . :unsure:

Rodrigo[/QUOTE]

the mfakto.ini file is a linux text file type
you can open it with wordpad(for windows) and then save it
after this you can open it with notepad (dos-textfile)