== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 10:34:54 (1775226894)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.18965 s, 16.9 MB/s
llite.lustre-ffff943111762000.read_ahead_stats=clear
llite.lustre-ffff943111762000.read_ahead_stats=
snapshot_time             1775226911.518029192 secs.nsecs
start_time                1775226903.537863337 secs.nsecs
elapsed_time              7.980165855 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          3 samples [pages]
async_readahead           2 samples [pages]
failed_to_fast_read       36 samples [pages]
mmap_range_read           28 samples [pages]
readahead_pages           35 samples [pages] 8 4096 25567
/usr/bin/fio
thp                     : Memory Advise Huge Page
read_test: (g=0): rw=read, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=mmap, iodepth=1
fio-3.19
Starting 1 process

read_test: (groupid=0, jobs=1): err= 0: pid=292302: Fri Apr  3 10:43:03 2026
  read: IOPS=10, BW=10.9MiB/s (11.5MB/s)(5120MiB/468296msec)
    clat (msec): min=27, max=239, avg=91.22, stdev=27.60
     lat (msec): min=27, max=239, avg=91.22, stdev=27.60
    clat percentiles (msec):
     |  1.00th=[   62],  5.00th=[   66], 10.00th=[   68], 20.00th=[   71],
     | 30.00th=[   73], 40.00th=[   77], 50.00th=[   80], 60.00th=[   85],
     | 70.00th=[   95], 80.00th=[  115], 90.00th=[  138], 95.00th=[  146],
     | 99.00th=[  174], 99.50th=[  188], 99.90th=[  205], 99.95th=[  220],
     | 99.99th=[  241]
   bw (  KiB/s): min= 4087, max=16384, per=100.00%, avg=11233.33, stdev=2947.33, samples=931
   iops        : min=    3, max=   16, avg=10.63, stdev= 2.93, samples=931
  lat (msec)   : 50=0.16%, 100=72.89%, 250=26.95%
  cpu          : usr=0.57%, sys=70.49%, ctx=13965, majf=5251, minf=1305737
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=5120,0,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
   READ: bw=10.9MiB/s (11.5MB/s), 10.9MiB/s-10.9MiB/s (11.5MB/s-11.5MB/s), io=5120MiB (5369MB), run=468296-468296msec