On 23/03/2016 5:41 AM, Charles Mills wrote:
There is a compiler for Rexx but its performance improvement is moderate.
It depends on what the REXX is doing. We compiled the ISPF DTL compiler and saw a significant performance improvement. IIRC, automation products like NetView get a free REXX compiler (they need it) and for that domain it makes a lot of sense. Lots of string parsing.
The REXX compiler unfortunately can produce suboptimal code that is much slower than interpreted REXX if you do a lot of memory allocations, think queues and stem variables. I profiled a compiled REXX program in APA and it appears to be doing a GETMAIN for each
allocation. Nearly 95% of the CPU time was spent in GETMAIN! Ouch :^/
TMON Tone? The TMON family of performance monitors was Landmark and is now ASG. Tone used to have that lower-overhead TSO replacement. They now have a mix of mainframe products including a dynamic STEPLIB product. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Edward Finnell Sent: Tuesday, March 22, 2016 2:23 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: CSVFETCH exit There were three CLIST compilers that I'm aware of. XLR8(Fischer), TMON(Tone), and CLICK(IBM Internal). In mid eighties we had good results with XLR8 and ADF II. As jobs changed fewer folks were willing to pay for it and development was less TSO sensitive. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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