4 May
2015
4 May
'15
12:31 p.m.
Hi list,
Recently I run micro tests on LMDB on DC3700 (200GB), I use bench code https://github.com/hyc/leveldb/tree/benches , I tested fillrandsync mode and collected iostat data, found that write amplification is large For fillrandsync case:
IOPS : 1020 ops/sec
Iostat data shows that w/s on that SSD is 8093, and avgqu-sz is ~ 1, await time is about 0.16 ms, so the write amplification is ~8, which is large to me, can someone help explain why write amplification is so large? thanks
Cheers, xinxin