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Tweak the database block cache size, and add config for it

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This commit is contained in:
Jakob Borg
2015-05-11 09:01:09 +02:00
parent 179c9ee8cc
commit c2f2d8771f
4 changed files with 16 additions and 13 deletions
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25
cmd/syncthing/main.go
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@@ -715,22 +715,21 @@ func syncthingMain() {
}
func dbOpts() *opt.Options {
// Calculate a sutiable database block cache capacity. We start at the
// default of 8 MiB and use larger values for machines with more memory.
// Calculate a sutiable database block cache capacity. Default is 8 MiB.
// In reality, the database will use twice the amount we calculate here,
// as it also has two write buffers each sized at half the block cache.
blockCacheCapacity := 8 << 20
if bytes, err := memorySize(); err == nil {
if bytes > 74<<30 {
// At 74 GiB of RAM, we hit a 256 MiB block cache (per the
// calculations below). There's probably no point in growing the
// cache beyond this point.
blockCacheCapacity = 256 << 20
} else if bytes > 8<<30 {
// Slowly grow from 128 MiB at 8 GiB of RAM up to 256 MiB for a
// ~74 GiB RAM machine
blockCacheCapacity = int(bytes/512) + 128 - 16
if v := cfg.Options().DatabaseBlockCacheMiB; v != 0 {
// Use the value from the config, if it's set.
blockCacheCapacity = v << 20
} else if bytes, err := memorySize(); err == nil {
// We start at the default of 8 MiB and use larger values for machines
// with more memory.
if bytes > 8<<30 {
// Cap the cache at 128 MB when we reach 8 GiB of RAM
blockCacheCapacity = 128 << 20
} else if bytes > 512<<20 {
// Grow from 8 MiB at start to 128 MiB of cache at 8 GiB of RAM.
blockCacheCapacity = int(bytes / 64)