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ISTAPCTW

ISTAPCTWはVTAMモジュールです。

ヒント

CICSのHPOパラメーターを使用すると、VTAMモジュールISTAPCTWでのCPU使用量を削減できる場合があります。このVTAMモジュールでのCPU削減率は一定ではありませんが、HPOに切り替えた場合、1～10%削減されたことが報告されています。HPOは命令パスの長さを短くして、複数のVTAM操作の同時処理を可能にします。HPOを実装する前に、IBMのマニュアルをよくお読みください。

VTAMネットワークだけを実行しているサイトでは、CICS SITパラメーターICVTSDを100ミリ秒から0ミリ秒に変更することで、VTAMモジュールISTAPCTWのセクションISTAPCIEのCPU消費量が削減されたことが報告されています。ICVTSDパラメーターを操作する前に、IBMのマニュアルをよくお読みください。

参考資料

『IBM CICS/ESA Installation Guide、Version 4 Release 1（SC33-1163）』

『IBM CICS/ESA Performance Guide、Version 4 Release 1（SC33-1183）』