| Gehel added a comment. |
Doing some quick math:
- wdqs eqiad cluster has between 20 and 40 requests per seconds according to our varnish stats
- 3 servers in that cluster
- let's assume requests are routed equally to all servers, that's 10 req/second/server
- 1.3 GB/sec allocation rate
- 130MB allocated per request
- the calculation above do not take writes into account, to the allocation per request is probably quite a bit lower
- 130MB / request is high, but not entirely crazy
Note that I also find anecdotal evidence through Google that an allocation rate of 1GB/core is sustainable (this does not match my experience, where I've seen issues much below that).
I need to dig more into G1 documentation to see how to tune generations sizes to optimize for short lived objects (which seems to be our case).
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Cc: Stashbot, gerritbot, Smalyshev, Gehel, Aklapper, Lordiis, Lucas_Werkmeister_WMDE, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, EBjune, merbst, Avner, Lewizho99, Maathavan, debt, Jonas, FloNight, Xmlizer, Izno, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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