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If you compile software on an expensive supercomputer, it’s a good idea to select the languages and compilers with particular care. We report on tried-and-proved tools used on Super ... , built by IBM at a cost of around EUR135 million, has 19 compute islands with approximately 8,200 cores each, and six newer islands with 14,300 cores each. It achieves a speed of around 6 petaFLOPS (10 ... If you compile software on an expensive supercomputer, it’s a good idea to select the languages and compilers with particular care. We report on tried-and-proved tools used on Super

-> ../../devices/pci0000:00/0000:00:03.0/net/eth0 |---lo -> ../../devices/virtual/net/lo The device is no longer listed in the default namespace. Listing 3 Configuring Devices $ ip link set eth1

=test test: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1): [w(1)][100.0%][w=654MiB/s][w=167k IOPS][eta 00m:00s

active_checks_enabled 1 22 passive_checks_enabled 0 23 check_command check_ssh 24 max_check_attempts 3 25

, ioengine=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1): [w(1)][100.0%][w=475MiB/s][w=122k IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=1634: Mon Oct 14 22:18:59 2019   write: IOPS=118k, BW=463MiB/s

without profiling). Listing 3 pprofile Output Command line: md_002.py Total duration: 1662.48s File: md_002.py File duration: 1661.74s (99.96%) Line #| Hits| Time| Time per hit

577600 6-16:26:40 40 608400 7-01:00:00 As you can see, it’s important to adjust your greylisting retry allowances depending on which mail server you use; otherwise, you

.519354 pkts=6 kpps=0.0 kbytes=0 mbps=0.0 nic_pkts=16 nic_drops=0 u=2 t=2 i=0 o=0 nonip=2 1415510244.519597 pkts=6 kpps=0.0 kbytes=0 mbps=0.0 nic_pkts=22 nic_drops=0 u=2 t=2 i=0 o=0 nonip=2 1415510247

rewinddir 0 0 0 0 0 0 0 0 fsync 21 21 21 21 21 22 26 31 lseekm 3

rewinddir 0 0 0 0 0 0 0 0 fsync 21 21 21 21 21 22 26 31 lseekm 3