User guide

3–InfiniBand
®
Cluster Setup and Administration
Performance Settings and Management Tips
IB0054606-02 A 3-35
The values picked for the various checks and tests may depend on the type of
node being configured. The tool is aware of two types of nodes—compute and
storage nodes.
Compute Nodes
Compute nodes are nodes which should be optimized for faster computation and
communication with other compute nodes.
Storage (Client or Server) Nodes
Storage nodes are nodes which serve as clients or servers in a parallel filesystem
network. Storage nodes (especially clients) are typically performing computation
and using MPI, in addition to sending and receiving storage network traffic. The
objective is to improve IB verbs communications while maintaining good MPI
performance.
OPTIONS
Table 3-4 list the options for the ipath_perf_tuning tool and describes each
option.
cstates Check whether (and which) C-States are enabled. C-States
should be turned off for best performance.
services Check whether certain system services (daemons) are
enabled. These services should be turned off for best perfor-
mance.
Table 3-4. ipath_perf_tuning Tool Options
Option Description
-h Display a short multi-line help message
-T test This option is used to limit the list of tests/check which the tool per-
forms to only those specified by the option. Multiple tests can be speci-
fied as a comma-separated list.
-I Run the tool in interactive mode. In this mode, the tool will prompt the
user for input on certain tests.
Table 3-3. Checks Preformed by ipath_perf_tuning Tool
Check Type Description