This change saves a lot of memory by reusing the underlying
gzip.{Writer,Reader}, which allocates up to 1.4mb at every instanciation
according to [1]. This was fixed by adding a Reset method by to the
object at [2].
The amount of memory (and GC time) saved is pretty high, as reported by
pprof:
flat flat% sum% cum cum%
28.33GB 85.70% 85.70% 32.74GB 99.05% compress/flate.NewWriter
flat flat% sum% cum cum%
19.39MB 16.74% 16.74% 22.07MB 19.05% compress/flate.NewWriter
And the benchmarks:
benchmark old ns/op new ns/op delta
BenchmarkGZIPCompressor1B-4 215170 22291 -89.64%
BenchmarkGZIPCompressor1KiB-4 225971 27213 -87.96%
BenchmarkGZIPCompressor8KiB-4 246696 54785 -77.79%
BenchmarkGZIPCompressor64KiB-4 444851 286924 -35.50%
BenchmarkGZIPCompressor512KiB-4 2279043 2115863 -7.16%
BenchmarkGZIPCompressor1MiB-4 4412989 4258635 -3.50%
benchmark old allocs new allocs delta
BenchmarkGZIPCompressor1B-4 17 0 -100.00%
BenchmarkGZIPCompressor1KiB-4 17 0 -100.00%
BenchmarkGZIPCompressor8KiB-4 17 0 -100.00%
BenchmarkGZIPCompressor64KiB-4 17 0 -100.00%
BenchmarkGZIPCompressor512KiB-4 17 0 -100.00%
BenchmarkGZIPCompressor1MiB-4 17 0 -100.00%
benchmark old bytes new bytes delta
BenchmarkGZIPCompressor1B-4 813872 8 -100.00%
BenchmarkGZIPCompressor1KiB-4 813872 16 -100.00%
BenchmarkGZIPCompressor8KiB-4 813875 27 -100.00%
BenchmarkGZIPCompressor64KiB-4 813918 190 -99.98%
BenchmarkGZIPCompressor512KiB-4 814928 1871 -99.77%
BenchmarkGZIPCompressor1MiB-4 820889 9735 -98.81%
[1] https://github.com/golang/go/issues/6138
[2] db12f9d4e4
Signed-off-by: Steeve Morin <steeve.morin@gmail.com>
With this change, the default dialer checks environment variables to see if proxy is needed. If so, it dials to the proxy and does an HTTP CONNECT handshake.
* use a global sharded pool of proto.Buffer caches in protoCodec
* fix goimports
* make global buffer pool index counter atomic
* hack to remove alloc in encode_len_struct
* remove extra slice alloc in proto codec marshal
* replce magic number for proto size field length with constant
* replace custom cache with sync.Pool
* remove 1 line functions in codec.go and add protoCodec microbenchmarks
* add concurrent usage test for protoCodec
* fix golint.gofmt,goimport checks
* fix issues in codec.go and codec_test.go
* use go parallel benchmark helpers
* replace proto.Codec with a guess of size needed
* update Fatalf -> Errorf in tests
* wrap proto.Buffer along with cached last size into larger struct for pool use
* make wrapped proto buffer only a literal
* fix style and imports
* move b.Run into inner function
* reverse micro benchmark op order to unmarshal-marshal and fix benchmark setup-in-test bug
* add test for large message
* remove use of defer in codec.marshal
* revert recent changes to codec bencmarks
* move sub-benchmarks into >= go-1.7 only file
* add commentfor marshaler and tweak benchmark subtests for easier usage
* move build tag for go1.7 on benchmarks to inside file
* move build tag to top of file
* comment Codec, embed proto.Buffer into cached struct and add an int32 cap
When an error implemented by the status package is returned from a service
handler, the server will transmit a rich status message in the
"grpc-status-details-bin" trailing metadata field if any detailed data is
attached to the error. Client-side, we will decode them if present in the
server's response and return them to the user code performing the RPC.
This is backward compatible with the existing errors supported by the grpc
package. However, the grpc.Errorf, grpc.Code and grpc.ErrorDesc functions for
managing errors are now deprecated; status.Errorf and status.Status type
asserions should be used instead.
* Add the initial service config support
* start scWatcher later
* remove timeoutCh
* address the comments
* deal with dial timeout
* defer cancel for the newly created context for correct lifetime management
* fix the defer order
* added other 2 missing cancels
