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W3 Cache & Server Problems

  • I just know that it’s not under
    constant stress. In normal situation it uses 1-1.5GB of available RAM
    and load average rarey reaches 5. It also runs smoothly for weeks until
    we get these peaks, the load gets suddendly high, memory is exhausted,
    the server starts swapping and it all freezes.

    I haven’t been able to pinpoint what causes these peaks, although they
    seem to be related with the process of recreating the page cache.

    Regarding the page cache (which is set to disk) I noticed that in the
    past weeks it didn’t seem to be correctly purged, as we reached 17k
    subdirs under wp-content/w3tc/pgcache (first level, not counting their
    subdirs) and a manual click on the empty page cache button only lead to
    a timeout (and a manual rm -rf took several minutes) — also updating
    users details gave a never ending spinning working icon (I believe that
    w3tc hooks page cache purge to user edit).

    After changing some settings yesterday, the page cache seems to be
    purged, but the server is completely unstable. The main problem is that
    now I still haven’t been able to revert to a stable situation, no
    matter what settings I use in w3tc.

    We have APC running on the server both for opcode caching and for manual
    caching of most widgets (this is done by our custom template).

    Let me know if you need more information

Viewing 8 replies - 1 through 8 (of 8 total)
Viewing 8 replies - 1 through 8 (of 8 total)
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