#20244
89%

Ran 17 Apr 2026 02:41PM UTC

Jobs 1

Files 647

Run time 2min

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Committed 17 Apr 2026 02:24PM UTC coverage: 88.793% (-0.02%) from 88.811%

Build # #20244

Build Type

push

github

Committed by

web-flow

Commit Message

core: Reduce per-stream idle memory by 20%

Metadata was accidentally being retained after the start of the call.
That can be an overwhelming percentage of memory for an idle RPC; don't
do that. The other changes are considerably smaller, but I happened to
notice them and the changes are straight-forward without magic numbers
(e.g., there's many arrays that could be tuned).

The regular interop server uses 4600 bytes per full duplex stream while
idle, but much of that is Census recorded events hanging around. Keeping
the Census integration but removing the Census impl (so a noop is used)
drops that to 3000 bytes. This change brings that down to ~2450 bytes
(which is still including stuff from TestServiceImpl). But there's very
little Metadata in the interop tests, so absolute real-life savings
would be much higher (but relative real-life savings may be lower,
because the application will often have more state).

The measurements were captured using a modified
timeout_on_sleeping_server client that had 100,000 concurrent full
duplex calls on one connection.

Coverage Stats

36017 of 40563 relevant lines covered (88.79%)

0.89 hits per line

Coverage Regressions

Lines	Coverage	∆	File
25	91.23	0.06%	../core/src/main/java/io/grpc/internal/ServerImpl.java
13	91.86	-4.41%	../api/src/main/java/io/grpc/Metadata.java
12	91.2	0.12%	../core/src/main/java/io/grpc/internal/MessageDeframer.java
3	75.86	-2.59%	../servlet/src/main/java/io/grpc/servlet/ServletServerStream.java
2	88.15	-0.95%	../netty/src/main/java/io/grpc/netty/NettyServer.java
1	93.83	-0.62%	../opentelemetry/src/main/java/io/grpc/opentelemetry/OpenTelemetryMetricSink.java

Jobs

ID	Job ID	Ran	Files	Coverage
1	#20244.1	17 Apr 2026 02:41PM UTC	647	88.79

grpc / grpc-java / #20244
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