On 2015/08/28 20:49:41, fedor.indutny wrote:
The results of benchmarks are:
./node-slow 1 && ./node-no-inline-fast 1 && ./node-fast 1
4997.4 ns/op
4701.6 ns/op
4685.7 ns/op
NOTE: `no-inline-fast` is the initial version of patch, `fast` - is
current,
`slow` - vanilla v8.
Please add the summary to the description.
The other thing that I have noticed is that there are not much scavenges
happening:
[65202:0x101804c00] 22 ms: Scavenge 1.9 (38.0) -> 1.8 (38.0) MB,
0.6 ms
[allocation failure].
[65202:0x101804c00] 23 ms: Scavenge 2.0 (38.0) -> 2.0 (39.0) MB,
0.5 ms
[allocation failure].
[65202:0x101804c00] 48 ms: Scavenge 3.5 (39.0) -> 3.1 (39.0) MB,
3.4 ms
[allocation failure].
[65202:0x101804c00] 57 ms: Mark-sweep 3.7 (39.0) -> 2.9 (40.0) MB,
4.7
ms
[external memory allocation limit reached.] [GC in old space requested].
[65202:0x101804c00] 68 ms: Mark-sweep 3.4 (40.0) -> 2.9 (40.0) MB,
9.4
ms
[external memory allocation limit reached.] [GC in old space requested].
[65202:0x101804c00] 81 ms: Mark-sweep 2.9 (40.0) -> 2.9 (40.0) MB,
12.4
ms
[external memory allocation limit reached.] [GC in old space requested].
[65202:0x101804c00] 82 ms: Mark-sweep 2.9 (40.0) -> 2.7 (40.0) MB,
1.7
ms
[external memory allocation limit reached.] [GC in old space requested].
[65202:0x101804c00] 91 ms: Mark-sweep 3.3 (40.0) -> 2.7 (40.0) MB,
3.4
ms
[external memory allocation limit reached.] [GC in old space requested].
I guess making them a scavenges might be the next step to improve the
performance.
I don't think there's much to improve on here with the current architecture.
The buffers in question are allocated externally (while the wrapping object
JSArrayBuffer is only conditionally allocated externally). We start an
incremental GC (see api.cc AdjustAmountOfExternalAllocatedMemory) once we
hit
the limit. For the scavenge map you need the scavenge information and for
the
full map you need a full transitive closure.
https://codereview.chromium.org/1316873004/
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