[Koha] circulation.pl is maxing out the CPU - Need help!

Katrin Fischer katrin.fischer.83 at web.de
Sun Jun 13 04:21:48 NZST 2021

Hi Chris,

more a wild guess, but we once had problems with calculating due dates
far into the future and a calendar bug. So Koha couldn't find any day
where the library was open for the due date.

Maybe check the circulation conditions and calendars for anything that
stands out?

Hope this helps,


On 12.06.21 14:13, Chris Brown wrote:
> Gentle Reader,
> We are running Koha 19.11 on Debian 9.11 (stretch). This supports 5 koha
> instances for some of the volunteer-run libraries in Sheffield. It has been
> stable and working fine for many months.
> Recently we have seen a few instances of the server load abruptly shooting
> up, maxing out the CPU and making the system unusable. Running "top" when
> this happens shows that there are two instances of
> /usr/share/koha/intranet/cgi-bin/circ/circulation.pl which between them are
> using 100% of the CPU.
> Rebooting clears the problem of course, but is not a practical long-term
> solution. I am looking for suggestions as to what might be causing this or
> how we might investigate further. Any help would be appreciated as this is
> having significant operational impact now.
> Thanks and Best Regards,
> Chris Brown
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