xperf_to_collapsedstacks.py 这个文件不是我写的哈，放在一起是功能相近做个备份

自动对比两份Etl文件在DiskIO和CPU使用率的差别，从而定位性能下降的原因

Pre-condition

• Install Xperf
• Install python 2.7
• Get script from //depot/Symantec_Client_Security/Docs/qa/Performance/Performance Data/Tools/AutoETL/
• (Optional for CPU analysis) set _NT_SYMBOL_PATH = srv*%SystemDrive%\symbols*http://msdl.microsoft.com/download/symbols;C:\Mysymbols; _NT_SYMCACHE_PATH = %SystemDrive%\SymCache
• (Optional for CPU analysis) Unzip symbols.zip which delivered with Build to C:\Mysymbols

Usage

• Python AutoEtl.py –c –o
• Support 2 counters :
  • cpu
  • diskio