[tor-relays] 100% CPU load on Windows Server 2019

[teor]

> On 21 Feb 2020, at 20:21, Michael Gerstacker <michael.gerstacker at googlemail.com> wrote:
> 
>> > On 18 Feb 2020, at 06:10, Michael Gerstacker <michael.gerstacker at googlemail.com> wrote:
>> > 
>> > Once the consensus diffs are processed the load drops to normal.
>> > After some time without anything noticeable for me in the debug logs the CPU suddenly jumps to 100% again and stays there till another consensus diffs are arriving.
>> > 
>> > Its not as worse as it was the first two days where i had 100% CPU load half of the time but i still have this about 10-15 times a day for a few seconds or minutes each.
>> > For the next few minutes after the CPU dropped to normal the throughput is close to zero so this cant be good for clients.
>> > 
>> > It would be nice to have a fix in 0.4.4 stable or earlier so that i can decide if i want to buy a Windows license key or rather shut it down.
>> 
>> Does setting "DirCache 0" in your torrc resolve the issue?
> 
> Yes it look like thats working.
> I lost the Guard flag (like expected) but in the last 24 hours i had no problems anymore.

Ok, thanks, I've opened a ticket to implement this workaround,
if we can't solve the underlying issue in the 0.4.4 release.

>> There's a suggested patch on the ticket:
>> https://trac.torproject.org/projects/tor/ticket/24857#comment:39
>> 
>> But we've had trouble getting people to help with Windows development
>> and testing.
>> 
>> Can you compile tor from source for Windows?
>  
> i've never done that before. If there is a step-by-step guide it might be interesting to learn.

Alex has put together a guide for cross-compiling for Windows on Linux:
https://github.com/ahf/tor-win32

>> Or if we get a fix merged into tor, can you install the Windows
>> "Tor Expert Bundle" ?
> 
> This should be no problem.
> 
> I think i will keep the Windows setup at least for some time so if i can help that way feel free to send me or point me to anything Windows related what needs some testing in real world.

Great, I've made a note on the ticket.

T

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