I have seen several presentations on Linux on 390. According to folks from the IBM Linux Lab in Germany, a VERY SMALL percentage of the code is IBM specific. That code is primarily in the device support areas.
Check out the following for more info ... http://www-1.ibm.com/servers/eserver/zseries/os/linux/index.html http://www-1.ibm.com/servers/eserver/zseries/os/vse/pdf2/wavv00/linuxintro.pdf http://www-1.ibm.com/servers/eserver/zseries/os/vse/pdf2/wavv02/Wavvklaus.pdf http://www-1.ibm.com/servers/eserver/zseries/os/vse/pdf2/wavv02/Wavvsavoie02.pdf ftp://ftp.software.ibm.com/eserver/zseries/zos/vse/pdf3/wavv03/Getting_started_with_Linux.pdf Bob Lee, VSE Systems Programmer | Voice: 909-594-5611 Mt. San Antonio College | Fax: 909-598-6995 1100 N. Grand Ave., Walnut CA 91789 | Internet: [EMAIL PROTECTED] Hi all: Background: My client has developed an application that runs under MVS/USS. It issues a FORK instruction which causes MVS to create a new address space for the new task. Considering the new application is going to be running approximately 5,000 tasks simultaneously, this presents a significant amount of overhead. I'm told a similar application running on an HP-UX environment (or other pure Unix environment I guess) wouldn't have the "new address space" overhead to contend with and the application would perform reasonably well. Yes, I know, this is clearly an application that should be running under CICS, but hey, I didn't design it. I was called in after the fact. At least it isn't in production... yet. Naturally, everyone is ready to trash the mainframe and go with a Unix solution on a Unix platform, but my client would prefer the application reside on the mainframe (too many reasons to explain herein). Enter L390: I suggested we take a look at L390. You can imagine the death stares I received. It went over like a lead balloon. The primary resistance stems from a common belief that "NOBODY's RUNNING LINUX TO DO REAL WORK" on the mainframe. My Questions: 1. Is anybody out there using L390 for "production" application workloads? 2. If so, are you willing to share some of your experiences and provide "real world" examples? Oh, one last thing: There seems to be a belief that L390 is a port of meta code instead of natively compiled code. My guess is that its heavily tweaked code compiled to run on z/Series hardware. In fact, the more that I think about it, the more I know it has to be rather unique considering the I/O subsystem. TIA. Ed Handschuh Enterprise Operating Systems Architect Independent Consultant SoftExcell, Inc. (215) 783-2208 - cell
