Set GOGC=50 on Zoekt (#5199)

* cmd/server/shared: set GOGC=50 on Zoekt (see sourcegraph/sourcegraph#3792)

* dev: set GOGC=50 on Zoekt (see sourcegraph/sourcegraph#3792)

* CHANGELOG: mention Zoekt GOGC=50 memory consumption change

* fixup

CHANGELOG.md

@@ -20,6 +20,7 @@ All notable changes to Sourcegraph are documented in this file.
 - In the [GitHub external service config](https://docs.sourcegraph.com/admin/external_service/github#configuration) it's now possible to specify `orgs` without specifying `repositoryQuery` or `repos` too.
 - Out-of-the-box TypeScript code intelligence is much better with an updated ctags version with a built-in TypeScript parser.
 - Sourcegraph uses Git protocol version 2 for increased efficiency and performance when fetching data from compatible code hosts.
+- Zoekt now runs with GOGC=50 by default, helping to reduce the memory consumption of Sourcegraph. [#3792](https://github.com/sourcegraph/sourcegraph/issues/3792)
 
 ### Fixed
 

cmd/server/shared/zoekt.go

@@ -24,7 +24,7 @@ func maybeZoektProcFile() []string {
 	}
 
 	return []string{
-		fmt.Sprintf("zoekt-indexserver: zoekt-sourcegraph-indexserver -sourcegraph_url http://%s -index %s -interval 1m -listen 127.0.0.1:6072 %s", frontendInternalHost, indexDir, debugFlag),
-		fmt.Sprintf("zoekt-webserver: zoekt-webserver -rpc -pprof -listen %s -index %s", defaultHost, indexDir),
+		fmt.Sprintf("zoekt-indexserver: env GOGC=50 zoekt-sourcegraph-indexserver -sourcegraph_url http://%s -index %s -interval 1m -listen 127.0.0.1:6072 %s", frontendInternalHost, indexDir, debugFlag),
+		fmt.Sprintf("zoekt-webserver: env GOGC=50 zoekt-webserver -rpc -pprof -listen %s -index %s", defaultHost, indexDir),
 	}
 }

dev/zoekt-wrapper

@@ -7,4 +7,9 @@ if [[ "$1" == "zoekt-sourcegraph-indexserver" ]]; then
     sleep 5
 fi
 
+# Mirroring:
+# - https://github.com/sourcegraph/infrastructure/blob/d67cfdaf7760b926df165745e40f7bd9507d1c20/docker-images/zoekt-indexserver/Dockerfile#L28-L35
+# - https://github.com/sourcegraph/infrastructure/blob/d67cfdaf7760b926df165745e40f7bd9507d1c20/docker-images/zoekt-webserver/Dockerfile#L27-L34
+export GOGC=50
+
 exec $@