z390 full release v1.4.02 with CICS compatible support for BMS plus

On June 30, 2008 z390 full release v1.4.02 was published with InstallShield for Windows and file image for Linux. This release has EXEC CICS compatible V5 support for BMS Basic Mapping Support plus the new SOA COBOL client application generation support using standard EZASOKET interface. Also this release has numerous HLASM and z9/z10 mainframe compatibility enhancements including HFP unnormalized instruction support.

Don Higgins
don@higgins.net
http://don-higgins.net

Higher precision timestamps for COBOL and Assembler performance measurement

Recently new higher precision timestamp support for use in COBOL and z390 assembler applicaitons has been added. Functions are available to obtain interval timing in nanoseconds or microseconds. For more information, visit new web page documenting timestamp support:

http://z390.sourceforge.net/z390_Standard_Timestamp_Support.htm

Don Higgins
don@higgins.net

z390 SOA Support for COBOL calling z390 Assembler using EZASOKET interface

Starting with z390 PTF v1.4.01e, z390 now supports COBOL calling z390 assembler using the IBM standard EZASOKET interface. For demo with source code and screen shot using Micro Focus COBOL calling z390 running on Windows Vista visit:

http://z390.sourceforge.net/z390_SOA_Support_for_COBOL_and_Assembler.htm

This same interface can in theory be used with COBOL running on any platform including mainframes and Linux connected to z390 SOA server running on any platform supporting J2SE Java connected to the same TCP/IP network.

Don Higgins
don@higgins.net

Optimizing COBOL generated mainframe assembler

To aid in analyzing mainframe COBOL programs a new z390 COBOL Portable Assembler option has been added in z390 PTF v1.4.01b. With this option installed, you can convert Enterprise COBOL or COBOL for OS/390 generated assembler listings into z390 assembler source programs which can be assembled, linked, and executed specifying starting and ending line numbers in order to unit test or benchmark specific generated code or supported COBOL statements with called functions. In this initial release only DISPLAY and STOP RUN function calls are supported, but requests for additional functions are welcome. Support for COBOL/370, COBOL for MVS, and VS COBOL II are also in development. For example generation and execution of DISPLAY and STOP RUN demo, install z390 v1.4.01, v1.4.01b PTF, and then enter the command cobol\paos\OSDEMO1. For additional information on this new option visit:

http://z390.sourceforge.net/z390_COBOLSupport.htm

Suggestions on how to make this new option more useful for unit testing and benchmarking COBOL code running on Windows or Linux are welcome. Sample COBOL generated assembler listings along with requests for additional function call support are also welcome.

Don Higgins
don@higgins.net

Why is a slower MIP rate with new z10 instructions better?

All

Why is a slower MIP rate with new z10 instructions better? The answer based on the initial results of problem #18 solution posted today on the ZMFACC Mainframe Assembler Coding Contest would appear to be that by using the new compare and branch instruction for z10 replacing 2 separate compare and branch on condition instructions results in a lower MIP rate but a faster execution time. Even though the MIP rate is lower, there are fewer instructions required to do the same work, and the elapsed time required is less. For the solution posted, the MIP rate using z390 on Intel Duo Core 2.1 GHZ processor dropped from 8.7 to 7.3 MIPS or 15%but the elapsed time also dropped from 343 ms to 271 ms or an 8% reduction in elapsed time. To see the source code and execution log output for this solution plus new problem #19 posting visit:

http://z390.sourceforge.net/z390_Mainframe_Assemble_Coding_Contest.htm

Don Higgins
don@higgins.net

z390 with 11 new ASSIST and 226 new z10 instructions

You never know what will happen at SHARE. This year SHARE started several new ventures for the z390 project resulting in the release of v1.4.01 today with the following major additions:

1. The ASSIST instructions for simplifying assembler program I/O have been added at the request of Northern Illinois University for use by students in their computer science classes. After installation of z390 v1.4.01 enter the command ASSIST assist\DEMOAST1 for demo.

2. Following IBM's announcement of a new z10 mainframe on February 26 during SHARE, a total of 226 new z10 instructions have been added to z390 for use by students learning about the z10 and for developers wanting unit test code before implementing on the new z10 processors. The new z10 instructions include:

a. Compare and branch - based on z390 testing these appear to be 15% faster than the equivalent compare followed by branch on condition instructions.

b. Move with optional specifications - this instruction which was previously implemented based on preliminary information released at SHARE has been expanded to support lengths greater than 4k.

c. The new translate and test extended instructions now support forword and backward translation for any length with 4 different translate table sizes 256, 512, 64k, and 128k.

d. The new rotate and select bits intructions have been implemented along with an improvement in the speed for existing RLL and RLLG rotate instructions which now use new more efficient shared rotate functions.

Since the new z10 instructions did not include the SQXTR extended decimal floating point square root instructions, the first proto-type millicode z390 version of this instruction has been implemented. To see how SQXTR instruction works, see the DFP solution to the standard deviation contest problem #12. To run the program, enter the command ASMLG mfacc\P12DSH3 after installation of z390 v1.4.01. Also see ZMFACC Mainframe Assembler Coding Contest problem #18 requiring benchmark program for compare and branch on the new z10 mainframe:

http://z390.sourceforge.net/z390_Mainframe_Assemble_Coding_Contest.htm

Don Higgins
don@higgins.net

Come to SHARE Session 8194 Feb. 25, 2008 to learn about z390 VSAM and CICS support

Come to the Disney World Coronado Springs Resort in Orlando Florida on February 25, 2008 and attend SHARE Session 8194 at 4:30 in Coronado E for update on z390 VSAM and CICS support. Speakers will include Melvyn Maltz and Don Higgins. Melvyn will provide update on EXEC CICS V4 compatible support including multiple TN3270 clients on TCP/IP network and browse support for ESDS, RRDS, and KSDS VSAM files. Don will provide overview of the z390 portable mainframe assembler and emulator plus update on VSAM externals and internals including KSDS insert support using AVL balanced trees for maximum performance. For more information on SHARE in Orlando and Session 894 visit:

http://share.org/events/Orlando/index.cfm

Don Higgins
don@higgins.net