Tom, I have a question on your comment about offloading XML to specialty engines. To quote:
Also, offloading to specialty processors does not change total CPU usage, and does not improve performance or throughput. It could change how much you pay to run it. My standard engines are kneecapped at about half power. Wouldn't offloading the XML processing to a specialty engine allow the XML work to run at full speed, therefore improving both performance and throughput? Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Tom Ross Sent: Friday, March 21, 2014 11:03 AM To: [email protected] Subject: XMLSS performance vs COBOL 4.1 runtime XML >One of my co-workers is trying to improve the performance of an Enterprise = >4.1 program that decomposes an input XML file into record fields for proces= >sing by later programs. The volume of the XML input has increased quite a = >bit and the performance may soon impact SLA's. >This program is currently compiled with XMLPARSE(COMPAT), so I advised him = >to try compiling a test version with XMLPARSE(XMLSS) and run some production >data through both versions a few times to get some average performance >numbers. The COBOL Performance Tuning Paper could have helped you out here, it says: | Performance considerations for XML PARSE example: | Five programs using XML PARSE were from 20% to 108% slower when using | XMLPARSE(XMLSS) compared to using XMLPARSE(COMPAT). >The XMLSS version seems to be running about 10% more CPU utilization and el= >apsed time than the production version, on average. That's not bad! In my personal tests, I got about 100% more CPU usage with XMLSS compared to COMPAT. >Are there any tweaks or adjustments that can or should be made to the XMLSS= > subsystem to improve performance? Our environment is z/OS V1 R12, z196 ha= >rdware. No, switch back to COMPAT. The COMPAT parser is a minimum funcoitn parser, and is missin a lot of function considered important by XML folks, like NAMESPACE support, UTF-8 and UTF-16 support and many other features. If you do not need those features, then we recommend that you don't choose the overhead of the XMLSS parser. Also, offloading to specialty processors does not change total CPU usage, and does not improve performance or throughput. It could change how how much you pay to run it. Cheers, TomR >> COBOL is the Language of the Future! << ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN The information contained in this message is confidential, protected from disclosure and may be legally privileged. If the reader of this message is not the intended recipient or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any disclosure, distribution, copying, or any action taken or action omitted in reliance on it, is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by replying to this message and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
