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Directory /proc/sys/ps4/local
ParaStation5 Administrator's Guide 19
• MaxAcksPending: maximum number of pending ACK messages until an "urgent" ACK messages will
be sent.
• MaxDevSendQSize: maximum number of entries of the (protocol internal) send queue to the network
device.
• MaxMTU: maximum packet size used for network packets. For sending packets, the minimum of MaxMTU
and service specific MTU will be used.
• MaxRecvQSize: size of the protocol internal receive queue.
• MaxResend: Number of retries until a connection is declared as dead.
• MaxSendQSize: size of the protocol internal send queue.
• ResendTimeout: delay in "jiffies" for resending packets not acknowledged up to now. Must be greater
then AckDelay.
5.2.3. Directory /proc/sys/ps4/local
Currently, there are no entries defined for this directory.
5.2.4. p4stat
The command p4stat can be used to list open sockets and network connections of the p4sock protocol.
$ /opt/parastation/bin/p4stat -s
Socket #0 : Addr: <00><00><00><00><00><'........' last_idx 0 refs 2
Socket #1 : Addr: <70><6f><72><74><33><'port384.' last_idx 0 refs 10
Socket #2 : Addr: <70><6f><72><74><31><'port144.' last_idx 0 refs 10
$ /opt/parastation/bin/p4stat -n
net_idx SSeqNo SWindow RSeqNo RWindow lusridx lnetidx rnetidx snq rnq refs
84 30107 30467 30109 30468 84 84 230 0 0 2
85 30106 30466 30106 30465 85 85 231 0 0 2
86 30107 30467 30109 30468 86 86 84 0 0 2
87 30106 30466 30106 30465 87 87 85 0 0 2
88 30107 30467 30109 30468 88 88 217 0 0 2
89 30106 30466 30106 30465 89 89 218 0 0 2
90 30106 30466 30106 30465 90 90 220 0 0 2
91 30106 30466 30106 30465 91 91 221 0 0 2
92 30001 30361 30003 30362 92 92 232 0 0 2
93 30001 30361 30003 30362 93 93 219 0 0 2
94 30000 30000 30001 30360 94 94 233 0 0 2
95 30000 30000 30001 30360 95 95 222 0 0 2
96 30000 30000 30001 30360 96 96 222 0 0 2
This command shows some protocol internal parameters, like open connections, sequence numbers,
reference counters, etc. For more information, see p4stat(8).
5.3. Controlling process placement
ParaStation includes sophisticated functions to control the process placement for newly created parallel
and serial tasks. These processes typically require a dedicated CPU (core). Upon task startup, the
environment variables PSI_NODES, PSI_HOSTS and PSI_HOSTFILE are looked up (in this order) to get