periodic memory release results in increased latency

[foreverneverer]

Pegasus version

pegasus-server-1.11.6-9f4e5ae-glibc2.12-release

Problem

periodic memory release results in increased latency

Reason

When build and run rdsn，the macro ENABLE_GPERF and the variable mem_release_enableddefault value is ON:

#ifdef DSN_ENABLE_GPERF
    if (_options.mem_release_enabled) {
        _mem_release_timer_task =
            tasking::enqueue_timer(LPC_MEM_RELEASE,
                                   &_tracker,
                                   []() {
                                       ddebug("Memory release has started...");
                                       ::MallocExtension::instance()->ReleaseFreeMemory();
                                       ddebug("Memory release has ended...");
                                   },
                                   std::chrono::milliseconds(_options.mem_release_interval_ms),
                                   0,
                                   std::chrono::milliseconds(_options.mem_release_interval_ms));
    }
#endif

but the strategies for freeing memory is unreasonable. for example, this time frees too much memory (5GB) at once and results in the significant latency.

Solution

Now the config.ini is not set the value about "release memory", we can only add the section and set the mem_release_enabled value is false.

[neverchanje]

This problem is resolved in v1.12.1. Refer to this PR: XiaoMi/rdsn#343.