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Add "approximate-memory-usage" property to leveldb::DB::GetProperty

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The approximate RAM usage of the database is calculated from the memory
allocated for write buffers and the block cache. This is to give an
estimate of memory usage to leveldb clients.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=104222307
This commit is contained in:
ssid
2015-09-29 11:52:21 -07:00
committed by Chris Mumford
parent 359b6bcec2
commit 528c2bc6ad
5 changed files with 42 additions and 1 deletions
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13
db/db_impl.cc
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@@ -1425,6 +1425,19 @@ bool DBImpl::GetProperty(const Slice& property, std::string* value) {
} else if (in == "sstables") {
*value = versions_->current()->DebugString();
return true;
} else if (in == "approximate-memory-usage") {
size_t total_usage = options_.block_cache->TotalCharge();
if (mem_) {
total_usage += mem_->ApproximateMemoryUsage();
}
if (imm_) {
total_usage += imm_->ApproximateMemoryUsage();
}
char buf[50];
snprintf(buf, sizeof(buf), "%llu",
static_cast<unsigned long long>(total_usage));
value->append(buf);
return true;
}
return false;