HTTP server benchmarking/load testing in Python

[Thomas Passin]

On 1/26/2023 5:00 PM, Chris Angelico wrote:
> On Fri, 27 Jan 2023 at 06:54, Thomas Passin <list1 at tompassin.net> wrote:
>>> Did you get a warning, or did you just decide to stop the test?
>>
>> (At least) one of the utilities, I forget which one, did show the
>> temperature in a danger zone.
> 
> I'm very curious as to which utility, and on what basis it called it
> "danger". Notably, whether there's any sort of actual manufacturer
> threshold that that was based on.

1. we're talking maybe a dozen years ago, I don't remember every detail 
about wordings.  Coretemp e.g., gives clear warnings (though at what I 
think are lower temperatures than necessary).

2. "What is Tjunction max temperature?"
Tjunction max is the maximum thermal junction temperature that a 
processor will allow prior to using internal thermal control mechanisms 
to reduce power and limit temperature. Activation of the processor's 
thermal control system may cause performance loss as the processor 
typically reduces frequency and power to prevent overheating. The 
maximum junction temperature limit varies per product and usually is 
between 100°C-110°C."

https://www.intel.com/content/www/us/en/support/articles/000005597/processors.html

The utilities I used always stated a 100 deg limit for Tj.

3. "Is it bad if my processor frequently approaches or reaches its 
maximum temperature?

Not necessarily. Many Intel® processors make use of Intel® Turbo Boost 
Technology, which allows them to operate at very high frequency for a 
short amount of time. When the processor is operating at or near its 
maximum frequency it's possible for the temperature to climb very 
rapidly and quickly reach its maximum temperature. In sustained 
workloads, it's possible the processor will operate at or near its 
maximum temperature limit. Being at maximum temperature while running a 
workload isn't necessarily cause for concern. Intel processors 
constantly monitor their temperature and can very rapidly adjust their 
frequency and power consumption to prevent overheating and damage."

(same source)

But automatic throttling wasn't common back when I first noticed the 
heating issue.

> Personally? Very dubious. Your entire premise is "five degrees MUST be
> a problem", without any visible basis.

Bridges are built with 150 - 200 % strength margin.  This doesn't mean 
you should deliberately overload one.

Heat is the enemy of electronics - a very old lesson.  Tj =~ 100 deg C 
for CPUs, a familiar figure.

My premise, to use your word, is not what you say.  It is to avoid 
excessive heat if at all possible, and if the manufacturer says the max 
junction temperature is 100 deg, I'm going to avoid approaching 100 deg 
if possible - or to minimize the stay there.  Most chemical effects are 
exponentially sensitive to temperature and problems with semiconductors 
are likely to be chemical - remember, e.g., the purple plague? A 
chemical problem.

So yes, checking with HWiNFO, my current system is throttling and power 
limiting during this particular test.  That's good.  And I'm still going 
to stay away from the highest temperatures when possible.

Nuff said!