ClickHouse uses jemalloc as the only option: https://github.com/ClickHouse/ClickHouse/

We have contributed patches and bugfixes to jemalloc as well.

I'd expect nothing less for clickhouse :)

I think tcmalloc will output protos too now which google pprof tool understands. If you’re using standard glibc malloc you’re probably leaving a lot of performance on the table

Performance wise it doesn't matter for most projects like games where allocations aren't done in hot paths anyway.

Problem with tcmalloc is fragmentation. Luckily I can then on aggressive decommit in some scenarios and that helps.