kangkaisen opened a new pull request #243: Skip unnecessary stream init and decrease the TCMalloc pressure (#242) URL: https://github.com/apache/incubator-doris/pull/243 Partially Fix [242](https://github.com/apache/incubator-doris/issues/242) After this PR, the perf result for SQL2 is below: ``` 7.75% palo_be palo_be [.] palo::memory_copy 5.47% palo_be [kernel.kallsyms] [k] clear_page_c_e 5.47% palo_be palo_be [.] palo::VectorizedRowBatch::dump_to_row_block 3.80% palo_be palo_be [.] SpinLock::SpinLoop 2.54% palo_be palo_be [.] operator new[] 2.38% palo_be palo_be [.] LZ4_decompress_safe 2.36% palo_be palo_be [.] palo::OlapScanner::get_batch 2.08% palo_be palo_be [.] tc_deletearray_nothrow 1.93% palo_be palo_be [.] tcmalloc::CentralFreeList::FetchFromOneSpans 1.92% palo_be palo_be [.] palo::Reader::_unique_key_next_row 1.48% palo_be palo_be [.] tcmalloc::ThreadCache::ReleaseToCentralCache ``` The Overhead for SpinLock::SpinLoop reduce obviously.
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