Allgatherv算法4指定TCP传输，np大规格执行报错

现象描述

集合操作Allgatherv算法4执行传输模式为tcp，多节点满核拉起进程报错：

[autotest1@hmpi01 ~]$ mpirun --allow-run-as-root --timeout 350 -np 1024  -N 128  --hostfile ~/hmpifile_2021/hostfile/hf8  -x UCX_TLS=tcp  -x UCG_PLANC_UCX_ALLGATHERV_ATTR=I:4 ~/hmpifile_2021/allgatherv/allgatherv
 
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[hmpi03:04566] pml_ucx.c:428  Error: ucp_ep_create(proc=514) failed: Destination is unreachable
[hmpi03:04563] pml_ucx.c:428  Error: ucp_ep_create(proc=515) failed: Destination is unreachable
[1684893155.703980] [hmpi06:4797 :1]         tcp_cm.c:749  UCX  WARN  tcp_iface 0x3c6e6b10: connection establishment for socket fd 755 from <invalid address family> to 192.168.0.1:51311 was unsuccessful
[1684893155.703997] [hmpi06:4797 :1]         tcp_cm.c:749  UCX  WARN  tcp_iface 0x3c6e6b10: connection establishment for socket fd 755 from <invalid address family> to 192.168.0.1:51311 was unsuccessful
[1684893256.847887] [hmpi05:11722:0]         tcp_cm.c:705  UCX  ERROR tcp_ep 0x86843a0: reached maximum number of connection retries (25)

可能原因

tcp建链产生的软中断重度负载，导致cpu无法处理，所以tcp建链超时。这对于Allgatherv线性算法来说，属于是tcp本身的限制，正常现象。

恢复步骤

Allgatherv使用tcp传输模式时，优先使用其他算法。