On Jun 25, 2020, at 4:00 PM, YiFei Zhu
<zhuyifei1999(a)gmail.com> wrote:
Should I open a phab ticket on this?
Yes please.
On Thu, Jun 25, 2020 at 2:55 PM Roy Smith <roy(a)panix.com> wrote:
>
> Heh, my mail about NFS being involved cross paths with yours. Thanks for digging
into this for me.
>
Should I open a phab ticket on this?
>
>
>> On Jun 25, 2020, at 3:50 PM, YiFei Zhu <zhuyifei1999(a)gmail.com> wrote:
>>
>> Looks like writev syscall does happen instantly, and tail on the host
>> that is running the uwsgi process is also returning the newly written
>> data instantly. Tail on a bastion host seems to see seconds of delay
>> for me, whether I use `tail -f` `tail -F` or `watch tail`. However,
>> the delay is gone if I use `tail -f` on the uwsgi host. Looks like the
>> kernel is buffering the data...
>>
>> YiFei Zhu
>>
>> On Thu, Jun 25, 2020 at 8:12 AM Roy Smith <roy(a)panix.com> wrote:
>>>
>>>
https://tools.wmflabs.org/spi-tools/spi/
>>>
>>> To generate a request, click the "Sock Info" button or the
"Index" link.
>>>
>>> The log file is /data/project/spi-tools/uwsgi.log
>>>
>>> Thanks.
>>>
>>>
>>>
>>> On Jun 25, 2020, at 2:12 AM, YiFei Zhu <zhuyifei1999(a)gmail.com> wrote:
>>>
>>> My guess is output stream buffering, at either the libc level or the
>>> python level.
>>>
>>> Which tool is this? I can probably strace and see if that is the case.
>>>
>>> YiFei Zhu
>>>
>>>
>>> On Wed, Jun 24, 2020 at 10:16 PM Roy Smith <roy(a)panix.com> wrote:
>>>
>>>
>>> I'm running a web server with "webservice --backend=kubernetes
python3.7". As I tail the uwsgi.log file, requests to my server get logged with very
long delays. I just timed one at about a minute and a half between when the request was
served (03:07:57 UTC 2020) and when it showed up in the log file (03:09:23 UTC 2020).
>>>
>>> What is going on here? Is there some way to make it not do this?
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