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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/10/20 18:28:25 UTC
[GitHub] [beam] lostluck opened a new pull request #15762: [BEAM-13082] Re-use dataWriter buffer.
lostluck opened a new pull request #15762:
URL: https://github.com/apache/beam/pull/15762
We currently garbage collect the buffers after flush, because we weren't sure we could re-use them. However, GRPC doesn't
hold onto anything after the Send, and since we're in a single threaded context, we can in fact avoid re-allocating these.
A benchmark was added and run 5 times in sequence before and after. The results for various write sizes using the go benchstat tool, shows significant savings on repeated allocations, in particular for large writes, and lower latency of at least 50% on smaller writes.
```
name old time/op new time/op delta
DataWriter/4B-8 11.1ns ±25% 5.5ns ±10% -50.16% (p=0.008 n=5+5)
DataWriter/16B-8 22.2ns ±15% 6.0ns ± 4% -72.87% (p=0.008 n=5+5)
DataWriter/1KB-8 949ns ±10% 51ns ±22% -94.64% (p=0.008 n=5+5)
DataWriter/4KB-8 3.47µs ± 3% 0.16µs ±30% -95.47% (p=0.008 n=5+5)
DataWriter/100KB-8 72.6µs ± 7% 4.3µs ±12% -94.01% (p=0.008 n=5+5)
DataWriter/1MB-8 313µs ± 5% 74µs ±21% -76.34% (p=0.008 n=5+5)
DataWriter/10MB-8 1.28ms ± 3% 1.15ms ±10% ~ (p=0.056 n=5+5)
DataWriter/100MB-8 15.6ms ±18% 12.4ms ± 2% -20.91% (p=0.008 n=5+5)
DataWriter/256MB-8 55.4ms ±87% 31.8ms ± 2% -42.48% (p=0.008 n=5+5)
name old alloc/op new alloc/op delta
DataWriter/4B-8 23.0B ± 0% 0.0B ~ (p=0.079 n=4+5)
DataWriter/16B-8 91.0B ± 0% 0.0B ~ (p=0.079 n=4+5)
DataWriter/1KB-8 5.89kB ± 0% 0.00kB ±100% -99.99% (p=0.008 n=5+5)
DataWriter/4KB-8 23.6kB ± 0% 0.0kB ±25% -99.99% (p=0.008 n=5+5)
DataWriter/100KB-8 492kB ± 0% 0kB ±14% -99.99% (p=0.008 n=5+5)
DataWriter/1MB-8 2.27MB ± 0% 0.00MB ±22% -99.98% (p=0.008 n=5+5)
DataWriter/10MB-8 10.5MB ± 0% 0.0MB ±13% -99.90% (p=0.008 n=5+5)
DataWriter/100MB-8 105MB ± 0% 1MB ± 7% -98.93% (p=0.008 n=5+5)
DataWriter/256MB-8 268MB ± 0% 8MB ± 6% -97.14% (p=0.008 n=5+5)
name old allocs/op new allocs/op delta
DataWriter/4B-8 0.00 0.00 ~ (all equal)
DataWriter/16B-8 0.00 0.00 ~ (all equal)
DataWriter/1KB-8 0.00 0.00 ~ (all equal)
DataWriter/4KB-8 0.00 0.00 ~ (all equal)
DataWriter/100KB-8 0.00 0.00 ~ (all equal)
DataWriter/1MB-8 2.00 ± 0% 1.00 ± 0% -50.00% (p=0.008 n=5+5)
DataWriter/10MB-8 6.00 ± 0% 5.00 ± 0% -16.67% (p=0.008 n=5+5)
DataWriter/100MB-8 6.00 ± 0% 5.00 ± 0% -16.67% (p=0.008 n=5+5)
DataWriter/256MB-8 6.00 ± 0% 5.00 ± 0% -16.67% (p=0.008 n=5+5)
```
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<tr>
<td>Python</td>
<td>---</td>
<td>---</td>
<td>---</td>
<td>---</td>
<td>---</td>
<td>---</td>
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</tr>
<tr>
<td>XLang</td>
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[GitHub] [beam] lostluck commented on pull request #15762: [BEAM-13082] Re-use dataWriter buffer.
Posted by GitBox <gi...@apache.org>.
lostluck commented on pull request #15762:
URL: https://github.com/apache/beam/pull/15762#issuecomment-947928937
R: @riteshghorse @jrmccluskey @youngoli
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[GitHub] [beam] jrmccluskey commented on a change in pull request #15762: [BEAM-13082] Re-use dataWriter buffer.
Posted by GitBox <gi...@apache.org>.
jrmccluskey commented on a change in pull request #15762:
URL: https://github.com/apache/beam/pull/15762#discussion_r733059677
##########
File path: sdks/go/pkg/beam/core/runtime/harness/datamgr.go
##########
@@ -529,7 +531,6 @@ func (w *dataWriter) Flush() error {
if w.buf == nil {
Review comment:
Why not delay getting the lock for the channel until after the check that the buffer is non-nil?
##########
File path: sdks/go/pkg/beam/core/runtime/harness/datamgr.go
##########
@@ -502,6 +502,8 @@ func (w *dataWriter) Close() error {
if err != nil {
return errors.Wrapf(err, "dataWriter[%v;%v].Close: error flushing buffer of length %d", w.id, w.ch.id, l)
}
+ // TODO(BEAM-13082): Consider a sync.Pool to reuse < 64MB buffers.
+ w.buf = nil
Review comment:
You're free to release the buffer to garbage collection here because the specific dataWriter won't be re-used, right?
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[GitHub] [beam] lostluck commented on a change in pull request #15762: [BEAM-13082] Re-use dataWriter buffer.
Posted by GitBox <gi...@apache.org>.
lostluck commented on a change in pull request #15762:
URL: https://github.com/apache/beam/pull/15762#discussion_r733104015
##########
File path: sdks/go/pkg/beam/core/runtime/harness/datamgr.go
##########
@@ -502,6 +502,8 @@ func (w *dataWriter) Close() error {
if err != nil {
return errors.Wrapf(err, "dataWriter[%v;%v].Close: error flushing buffer of length %d", w.id, w.ch.id, l)
}
+ // TODO(BEAM-13082): Consider a sync.Pool to reuse < 64MB buffers.
+ w.buf = nil
Review comment:
Correct. The close call happens in DataSink.FinishBundle, or if there are connection problems. Either way, we want to drop the buffer.
Closeable Readers and Writers tend to be unusable after a "Close", and it would be surprising otherwise. If a plan were re-used, it would need a new DataWriter anyway, which happens in DataSink.StartBundle.
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[GitHub] [beam] lostluck merged pull request #15762: [BEAM-13082] Re-use dataWriter buffer.
Posted by GitBox <gi...@apache.org>.
lostluck merged pull request #15762:
URL: https://github.com/apache/beam/pull/15762
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[GitHub] [beam] lostluck commented on a change in pull request #15762: [BEAM-13082] Re-use dataWriter buffer.
Posted by GitBox <gi...@apache.org>.
lostluck commented on a change in pull request #15762:
URL: https://github.com/apache/beam/pull/15762#discussion_r733104462
##########
File path: sdks/go/pkg/beam/core/runtime/harness/datamgr.go
##########
@@ -529,7 +531,6 @@ func (w *dataWriter) Flush() error {
if w.buf == nil {
Review comment:
Good call! It's a microoptimization (it's very unlikely for the buffer to be empty when flushing, but no harm in it. Done.
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