.TCMalloc thread cache is now configurable
With Red Hat Ceph Storage 1.3.2, support for modifying the size of the `TCMalloc` thread cache has been added. Increasing the thread cache size significantly improves Ceph cluster performance.
To set the thread cache size, edit the value of the `TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES` parameter in the Ceph system configuration
file, that is `/etc/sysconfig/ceph` for Red Hat Enterprise Linux and `/etc/default/ceph` for Ubuntu.
In addition, the default value of `TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES` has been changed from 32 MB to 128 MB.