IBM z/OS - Manual (Page 83)

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– post-processing of Performance Toolkit for VM history
fi les and of VM monitor data captured by the MON-
WRITE utility
– viewing of performance monitor data using either Web
browsers or PC-based 3270 emulator graphics
The toolkit also provides the capability to monitor TCP/IP
for z/VM, as well as to process Linux performance data.
Application Enablement
CMS will host the new C/C++ for z/VM compiler (5654-A22).
This environment allows C/C++ programs to be compiled
and executed on CMS and creates portability between z/VM
and z/OS C/C++ programs. C/C++ source fi les can be read
from a CMS minidisk, the SFS, or the Byte File System (BFS)
and output can be written to any of these fi le systems. C/C++
will only execute on z/VM V4.4 and can only be licensed to
operate on standard processor engines. In order to support
the C/C++ for z/VM compiler, the C/C++, the Language
Environment has been updated to the level shipped with
z/OS V1.4 and is integrated into the base of z/VM V4.4.
Networking with z/VM
TCP/IP for z/VM delivers expanded Internet/intranet
access, improved e-business performance and extended
function. Performance of the TCP/IP stack was enhanced
by redesigning algorithms to reduce path lengths, recod-
ing procedures to optimize high-use paths, identifying
and implementing performance improvement items, and
adding virtual multiprocessing capabilities.
TCP/IP is designed to support the z/Architecture
HiperSockets function for high-speed communication
among virtual machines and logical partitions within the
same zSeries server. The HiperSockets function allows vir-
tual machines and logical partitions to communicate inter-
nally over the memory bus using the internal-queued-direct
(IQD) channel type in the z990, z890, z900, and z800. TCP/
IP broadcast support is now available for the HiperSockets
environment when utilizing Internet Protocol version 4 (IPv4)
with z/VM V4.4. Applications that use the broadcast function
can now propagate frames to all TCP/IP applications.
The z890 and z990 servers include an important perfor-
mance enhancement that virtualizes adapter interruptions
and can be used with V=V guests (pageable guests) on
z/VM V4.4. With the enhancement of the TCP/IP stack in
z/VM V4.4 to use adapter interruptions for OSA-Express,
TCP/IP for VM can benefi t from this performance assist for
both HiperSockets and OSA-Express adapters.
z/VM V4.4 exploits the Virtual Local Area Network (VLAN)
technology. VLANs ease the administration of logical
groups of users so that they can communicate as if they
were on the same physical LAN. VLANs help increase
traffi c fl ow and may help reduce overhead to allow the
organization of networks by traffi c patterns rather than by
physical location. To support VLAN, z/VM V4.4 provides:
• Enhancements to TCP/IP for z/VM to enable member-
ship in a VLAN for QDIO and HiperSockets adapters
• Enhancements to z/VM guest-LAN simulation to allow
virtual QDIO and HiperSockets adapters to participate in
a VLAN
• Management and control of VLAN topology by the z/VM
virtual switch