== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 16:02:28 (1777060948)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 18.2173 s, 5.8 MB/s
llite.lustre-ffff9983be3b7000.read_ahead_stats=clear
llite.lustre-ffff9983be3b7000.read_ahead_stats=
snapshot_time             1777060993.592817987 secs.nsecs
start_time                1777060973.991200988 secs.nsecs
elapsed_time              19.601616999 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=291620: Fri Apr 24 16:24:01 2026
  read: IOPS=4, BW=4230KiB/s (4331kB/s)(5120MiB/1239473msec)
    clat (msec): min=64, max=662, avg=241.50, stdev=76.66
     lat (msec): min=64, max=662, avg=241.51, stdev=76.66
    clat percentiles (msec):
     |  1.00th=[  150],  5.00th=[  165], 10.00th=[  174], 20.00th=[  188],
     | 30.00th=[  199], 40.00th=[  207], 50.00th=[  218], 60.00th=[  230],
     | 70.00th=[  245], 80.00th=[  284], 90.00th=[  368], 95.00th=[  414],
     | 99.00th=[  481], 99.50th=[  510], 99.90th=[  592], 99.95th=[  617],
     | 99.99th=[  667]
   bw (  KiB/s): min= 1889, max= 8192, per=100.00%, avg=4247.32, stdev=1386.98, samples=2461
   iops        : min=    1, max=    8, avg= 3.46, stdev= 1.43, samples=2461
  lat (msec)   : 100=0.10%, 250=72.42%, 500=26.86%, 750=0.62%
  cpu          : usr=0.47%, sys=71.16%, ctx=19276, majf=5362, minf=1305627
  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=4230KiB/s (4331kB/s), 4230KiB/s-4230KiB/s (4331kB/s-4331kB/s), io=5120MiB (5369MB), run=1239473-1239473msec