== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 09:00:52 (1775048452)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.43509 s, 19.3 MB/s
llite.lustre-ffff94999f486800.read_ahead_stats=clear
llite.lustre-ffff94999f486800.read_ahead_stats=
snapshot_time             1775048465.212168020 secs.nsecs
start_time                1775048459.406836175 secs.nsecs
elapsed_time              5.805331845 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=292279: Wed Apr  1 09:07:48 2026
  read: IOPS=12, BW=12.8MiB/s (13.4MB/s)(5120MiB/400605msec)
    clat (msec): min=48, max=233, avg=78.08, stdev=27.60
     lat (msec): min=48, max=233, avg=78.08, stdev=27.60
    clat percentiles (msec):
     |  1.00th=[   53],  5.00th=[   57], 10.00th=[   58], 20.00th=[   60],
     | 30.00th=[   62], 40.00th=[   65], 50.00th=[   67], 60.00th=[   71],
     | 70.00th=[   77], 80.00th=[   87], 90.00th=[  131], 95.00th=[  138],
     | 99.00th=[  153], 99.50th=[  182], 99.90th=[  218], 99.95th=[  224],
     | 99.99th=[  234]
   bw (  KiB/s): min= 4096, max=20480, per=100.00%, avg=13129.58, stdev=3816.05, samples=798
   iops        : min=    4, max=   20, avg=12.82, stdev= 3.73, samples=798
  lat (msec)   : 50=0.27%, 100=83.11%, 250=16.62%
  cpu          : usr=0.62%, sys=85.86%, ctx=11638, majf=5121, minf=1305868
  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=12.8MiB/s (13.4MB/s), 12.8MiB/s-12.8MiB/s (13.4MB/s-13.4MB/s), io=5120MiB (5369MB), run=400605-400605msec