chenBright commented on PR #3290:
URL: https://github.com/apache/brpc/pull/3290#issuecomment-4951776676

   ```shell
   ./ubring_performance_client -use_ubring=true -echo_attachment=true 
-attachment_size=6291456
   I0712 23:42:12.017195 3264863     0 
/workspace/cgm/brpc/src/brpc/server.cpp:1243 StartInternal] 
Server[DummyServerOf(./ubring_performance_client)] is serving on port=8001.
   I0712 23:42:12.017340 3264863     0 
/workspace/cgm/brpc/src/brpc/server.cpp:1246 StartInternal] Check out 
http://k8s-al-sh-gpu-rdma-h20-0032:8001 in web browser.
   [Threads: 1, Depth: 1, Attachment: 6291456B, UBRING: yes, Echo: yes]
   I0712 23:42:12.026167 3264863     0 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_mgr.cpp:72 ShmMgrInit] shm mgr init 
success, shm type=1
   E0712 23:42:12.026774 3264871 4294968065 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_ipc.cpp:39 ReserveIpcShm] IPC 
reserve shm=UBRING_127.0.0.1:62484_C length=4194304 failed, ret(28).
   E0712 23:42:12.026797 3264871 4294968065 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_mgr.cpp:114 ShmLocalCalloc] Failed 
to alloc local shm.
   E0712 23:42:12.026802 3264871 4294968065 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:926 ApplyAndMapLocalShm] Trx 
apply local shared memory failed, local shm name=UBRING_127.0.0.1:62484_C, 
rc=-100
   E0712 23:42:12.026807 3264871 4294968065 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:840 UbrAllocateLocalShm] Trx 
apply or map local shared memory failed, localName=127.0.0.1:62484
   W0712 23:42:12.026816 3264871 4294968065 
/workspace/cgm/brpc/src/brpc/ubshm/ub_endpoint.cpp:348 
ProcessHandshakeAtClient] Fallback to tcp:brpc::Socket{id=1 fd=8 
addr=0.0.0.0:8002:62484} (0x5587f03b4f40)
   Avg-Latency: 2486, 90th-Latency: 2630, 99th-Latency: 3961, 99.9th-Latency: 
4696, Throughput: 2344.77MB/s, QPS: 0k, Server CPU-utilization: 191%, Client 
CPU-utilization: 179%
   E0712 23:42:32.030796 3264873 489626272583 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:1035 UbrTrxCloseCheck] Trx close 
failed, client trx is null.
   [Threads: 2, Depth: 1, Attachment: 6291456B, UBRING: yes, Echo: yes]
   E0712 23:42:32.035919 3264871 493921240022 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_ipc.cpp:39 ReserveIpcShm] IPC 
reserve shm=UBRING_127.0.0.1:52664_C length=4194304 failed, ret(28).
   E0712 23:42:32.035941 3264871 493921240022 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_mgr.cpp:114 ShmLocalCalloc] Failed 
to alloc local shm.
   E0712 23:42:32.035947 3264871 493921240022 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:926 ApplyAndMapLocalShm] Trx 
apply local shared memory failed, local shm name=UBRING_127.0.0.1:52664_C, 
rc=-100
   E0712 23:42:32.035951 3264871 493921240022 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:840 UbrAllocateLocalShm] Trx 
apply or map local shared memory failed, localName=127.0.0.1:52664
   W0712 23:42:32.035958 3264871 493921240022 
/workspace/cgm/brpc/src/brpc/ubshm/ub_endpoint.cpp:348 
ProcessHandshakeAtClient] Fallback to tcp:brpc::Socket{id=3 fd=8 
addr=0.0.0.0:8002:52664} (0x5587f03b55c0)
   W0712 23:42:32.036008 3264863     0 
/workspace/cgm/brpc/example/ubring_performance/client.cpp:131 Init] RPC call 
failed, retrying... (3 left): [E11]Fail to connect brpc::Socket{id=3 fd=8 
addr=0.0.0.0:8002:52664} (0x5587f03b55c0): Resource temporarily unavailable
   E0712 23:42:32.136118 3264873 4294970112 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:1035 UbrTrxCloseCheck] Trx close 
failed, client trx is null.
   I0712 23:42:32.136156 3264873 4294970112 
/workspace/cgm/brpc/src/brpc/socket.cpp:2570 CheckHealth] Checking Socket{id=3 
addr=0.0.0.0:8002} (0x5587f03b55c0)
   I0712 23:42:32.136296 3264871 4294970112 
/workspace/cgm/brpc/src/brpc/socket.cpp:2630 AfterRevived] Revived Socket{id=3 
addr=0.0.0.0:8002} (0x5587f03b55c0) (Connectable)
   E0712 23:42:33.036319 3264871 528280980045 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_ipc.cpp:39 ReserveIpcShm] IPC 
reserve shm=UBRING_127.0.0.1:52674_C length=4194304 failed, ret(28).
   E0712 23:42:33.036349 3264871 528280980045 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_mgr.cpp:114 ShmLocalCalloc] Failed 
to alloc local shm.
   E0712 23:42:33.036353 3264871 528280980045 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:926 ApplyAndMapLocalShm] Trx 
apply local shared memory failed, local shm name=UBRING_127.0.0.1:52674_C, 
rc=-100
   E0712 23:42:33.036356 3264871 528280980045 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:840 UbrAllocateLocalShm] Trx 
apply or map local shared memory failed, localName=127.0.0.1:52674
   W0712 23:42:33.036364 3264871 528280980045 
/workspace/cgm/brpc/src/brpc/ubshm/ub_endpoint.cpp:348 
ProcessHandshakeAtClient] Fallback to tcp:brpc::Socket{id=3 fd=8 
addr=0.0.0.0:8002:52674} (0x5587f03b55c0)
   W0712 23:42:33.036402 3264863     0 
/workspace/cgm/brpc/example/ubring_performance/client.cpp:131 Init] RPC call 
failed, retrying... (2 left): [E115]Fail to connect brpc::Socket{id=3 fd=8 
addr=0.0.0.0:8002:52674} (0x5587f03b55c0): Operation now in progress
   E0712 23:42:33.236540 3264873 4294970113 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:1035 UbrTrxCloseCheck] Trx close 
failed, client trx is null.
   I0712 23:42:33.236592 3264873 4294970113 
/workspace/cgm/brpc/src/brpc/socket.cpp:2570 CheckHealth] Checking Socket{id=3 
addr=0.0.0.0:8002} (0x5587f03b55c0)
   I0712 23:42:33.236752 3264871 4294970113 
/workspace/cgm/brpc/src/brpc/socket.cpp:2630 AfterRevived] Revived Socket{id=3 
addr=0.0.0.0:8002} (0x5587f03b55c0) (Connectable)
   E0712 23:42:34.036694 3264871 519691043831 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_ipc.cpp:39 ReserveIpcShm] IPC 
reserve shm=UBRING_127.0.0.1:52688_C length=4194304 failed, ret(28).
   E0712 23:42:34.036725 3264871 519691043831 
/workspace/cgm/brpc/src/brpc/ubshm/shm/shm_mgr.cpp:114 ShmLocalCalloc] Failed 
to alloc local shm.
   E0712 23:42:34.036730 3264871 519691043831 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:926 ApplyAndMapLocalShm] Trx 
apply local shared memory failed, local shm name=UBRING_127.0.0.1:52688_C, 
rc=-100
   E0712 23:42:34.036733 3264871 519691043831 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:840 UbrAllocateLocalShm] Trx 
apply or map local shared memory failed, localName=127.0.0.1:52688
   W0712 23:42:34.036741 3264871 519691043831 
/workspace/cgm/brpc/src/brpc/ubshm/ub_endpoint.cpp:348 
ProcessHandshakeAtClient] Fallback to tcp:brpc::Socket{id=3 fd=8 
addr=0.0.0.0:8002:52688} (0x5587f03b55c0)
   W0712 23:42:34.036777 3264863     0 
/workspace/cgm/brpc/example/ubring_performance/client.cpp:131 Init] RPC call 
failed, retrying... (1 left): [E115]Fail to connect brpc::Socket{id=3 fd=8 
addr=0.0.0.0:8002:52688} (0x5587f03b55c0): Operation now in progress
   E0712 23:42:34.436931 3264873 4294970114 
/workspace/cgm/brpc/src/brpc/ubshm/ub_ring.cpp:1035 UbrTrxCloseCheck] Trx close 
failed, client trx is null.
   I0712 23:42:34.436981 3264873 4294970114 
/workspace/cgm/brpc/src/brpc/socket.cpp:2570 CheckHealth] Checking Socket{id=3 
addr=0.0.0.0:8002} (0x5587f03b55c0)
   I0712 23:42:34.437151 3264871 4294970114 
/workspace/cgm/brpc/src/brpc/socket.cpp:2630 AfterRevived] Revived Socket{id=3 
addr=0.0.0.0:8002} (0x5587f03b55c0) (Connectable)
   E0712 23:42:35.036864 3264863     0 
/workspace/cgm/brpc/example/ubring_performance/client.cpp:135 Init] RPC call 
failed after multiple retries
   ```
   
   I failed to run the ubring example with the latest code; see the log above 
for details. @zchuango 


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