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Old 2021-06-30, 09:23   #1
birtwistlecaleb
 
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Jun 2021

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Default Sudden drop in performance

Around now, my iteration times dropped from 30 ms per iteration to 100ms. (P-1 factor) When I was not using it. What do you think happened?
P95 version: 30.3b6
OS: Windows 7 Enterprise
Exponent: 104596693
Stage: 2
Screenshot\/
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Last fiddled with by birtwistlecaleb on 2021-06-30 at 09:49 Reason: typo
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Old 2021-06-30, 09:36   #2
axn
 
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Thanks for the text book "how not to report an issue".

Your post lacks any sort of information that could help us diagnose the issue.

At minimum:
1) Your setup (h/w, OS, P95 version)
2) The exponent & FFT
3) What stage the test is in.
4) Screenshot
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Old 2021-06-30, 11:31   #3
sdbardwick
 
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On Windows, the first thing I'd look for is Windows starting up a background task like Windows Defender (or whatever the Win7 equivalent was) by checking Task Manager and seeing what the CPU utilizations are for running processes. Might need to click "See Processes from All Users" button to get the full picture of running processes.CTRL+SHIFT+ESC starts task manager, or right click on taskbar and click Task Manager.
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Old 2021-06-30, 12:36   #4
axn
 
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The screenshot doesn't show the section where slowdown happened...

You said "my iteration times dropped from 30 ms per iteration to 100ms". The screenshot only show stage two and about 0.13 sec.

Do you have a screenshot where the iteration time changed from 30 to 100ms?

BTW, it looks like you're using a very small value of "number of iterations between output". Please don't do that. Use a value large enough so that the updates happen every few minutes, not 0.1 sec.

You have not given your h/w details: CPU & RAM details. Also, please give the B1 & B2 values being used.
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Old 2021-06-30, 14:24   #5
kriesel
 
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Haven't tested on the work types that involve stage two, but for those that involve output of res64 to screen, producing frequent screen updates including res64 CAUSES a slowdown. https://www.mersenneforum.org/showpo...44&postcount=6


Edit:
This new thread was unnecessary/inappropriate. Use of the existing prime95 v30.3 thread would have been better. Note that with enough persistence ignoring moderators' guidance to use existing threads, users do get warned or temporarily banned. Don't go there. I believe you've (birtwistlecaleb) already attracted their attention as a problem user.

Consider upgrading to v30.6, after backup of the interim run files, as insurance against a restart from beginning of stage 2.

Task Manager is good for showing what processes are using how much of CPU, ram, disk, etc. Sort on the column of your choice. If a system backup or full virus scan or windows update or whatever launched, it will use resources, and prime95 / mprime will use less so run less quickly. There are also certain anomalous system behaviors that can produce the effect; loss of communication with a GPU, I've seen absorb a CPU real core for minutes to hours on occasion. Running a video-intensive game would surely impact prime95 throughput.

There are many ways to determine on Windows how much ram is installed. Do your due diligence, in the first post of a problem. Too many times of not doing so, may get you ignored or added to some forum participants' ignore lists to automate the ignore.
What did you buy?
Task Manager
In Win10, Settings, System, About
In Win 7, Control Panel, System and Security, System
Numerous third party utilities; CPU-Z, (GPU-Z will show system memory in use), HWInfo, ...
Read and understand the output. Don't just skim right past the answer and claim it's not provided.

In general, read, understand, and follow https://www.mersenneforum.org/showpo...64&postcount=2, especially the paragraph beginning "Make an effort" and the paragraph following.

Don't expect to get an answer giftwrapped/spoonfed.

Don't tell us a utility doesn't provide information we know it does.
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Old 2021-06-30, 16:01   #6
birtwistlecaleb
 
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It still is slow without small iteration time.
1: I don't 2: My cpu is an Intel(R) Core(TM) 15-4300M, and ram isn't shown in the cpu menu.
2: B1=742000 B2=19199000
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Last fiddled with by birtwistlecaleb on 2021-06-30 at 16:11 Reason: 1 to 3 -> 1 to 2
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Old 2021-06-30, 16:30   #7
axn
 
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Quote:
Originally Posted by birtwistlecaleb View Post
It still is slow without small iteration time.
1: I don't
Next time it shows the equivalent of 30ms/iteration, give us the screenshot.

Quote:
Originally Posted by birtwistlecaleb View Post
2: My cpu is an Intel(R) Core(TM) 15-4300M, and ram isn't shown in the cpu menu.
Is this a laptop?

To know more about your hardware (including RAM, among other things), you can use CPU-Z.
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Old 2021-06-30, 16:34   #8
birtwistlecaleb
 
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Quote:
Originally Posted by axn View Post
Is this a laptop?
Yes it is, with an extra monitor also.
Quote:
Originally Posted by axn View Post
To know more about your hardware (including RAM, among other things), you can use CPU-Z.
The closest I got is the DRAM frequency, at ~799 Mhz.

Last fiddled with by birtwistlecaleb on 2021-06-30 at 16:41 Reason: typo
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