[GitHub] [doris] xinyiZzz commented on a diff in pull request #15382: [Enhancement](Jemalloc): enable prof & correct the conf name in jemalloc

[GitBox]

xinyiZzz commented on code in PR #15382:
URL: https://github.com/apache/doris/pull/15382#discussion_r1057434373

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bin/start_be.sh:
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@@ -233,7 +233,8 @@ set_tcmalloc_heap_limit() {
 ## set hdfs conf
 export LIBHDFS3_CONF="${DORIS_HOME}/conf/hdfs-site.xml"
 
-export 
MALLOC_CONF="percpu_arena:percpu,background_thread:true,metadata_thp:auto,muzzy_decay_ms:30000,dirty_decay_ms:30000,oversize_threshold:0,lg_tcache_max:16"
+# see https://github.com/jemalloc/jemalloc/issues/2366
+export 
JEMALLOC_CONF="percpu_arena:percpu,background_thread:true,metadata_thp:auto,muzzy_decay_ms:30000,dirty_decay_ms:30000,oversize_threshold:0,lg_tcache_max:16,prof:true,prof_prefix:jeprof.out"

Review Comment:
   `prof:true` opening the profile seems to have an impact on performance.
   
   can explain how to use jemalloc heap profile in `debug-tool.md`, which is 
currently based on tcmalloc.
   
   
![image](https://user-images.githubusercontent.com/13197424/209611558-09a75210-52d0-47b6-8e1d-abd886bf4ac2.png)
   



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