<p></p>
<p dir="auto">We did some debugging on piasa today.</p>
<p dir="auto">Increasing QMAX to 256 had no impact. Increasing REQ_LIMIT and DIRTY_LIMIT to 256 and 8000 had no impact. The following patchset had no impact<br>
<a href="https://github.com/openstreetmap/mod_tile/files/12652297/download.compton.nu_tmp_queue-concurrency.patch.txt">download.compton.nu_tmp_queue-concurrency.patch.txt</a>.<br>
The testing with the patchset and with the REQ_LIMIT and DIRTY_LIMIT changes was not <em>identical</em> to the previous testing, because it was built with march=native.</p>
<p dir="auto">Running for longer established that the spikes of working at 100% happen every 8.4 minutes. In tests on the 18th, they were happening 7.25 minutes, and on the 15th, every 7.5 minutes.</p>

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