== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 07:20:56 (1773228056)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.43584 s, 19.3 MB/s
llite.lustre-ffff9d4703049800.read_ahead_stats=clear
llite.lustre-ffff9d4703049800.read_ahead_stats=
snapshot_time             1773228069.155263230 secs.nsecs
start_time                1773228063.316574210 secs.nsecs
elapsed_time              5.838689020 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=292871: Wed Mar 11 07:28:30 2026
  read: IOPS=11, BW=11.7MiB/s (12.2MB/s)(5120MiB/439345msec)
    clat (msec): min=42, max=318, avg=85.65, stdev=48.62
     lat (msec): min=42, max=318, avg=85.65, stdev=48.62
    clat percentiles (msec):
     |  1.00th=[   47],  5.00th=[   54], 10.00th=[   56], 20.00th=[   59],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   67], 60.00th=[   70],
     | 70.00th=[   75], 80.00th=[   84], 90.00th=[  161], 95.00th=[  211],
     | 99.00th=[  262], 99.50th=[  279], 99.90th=[  300], 99.95th=[  317],
     | 99.99th=[  317]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=11967.03, stdev=5036.45, samples=876
   iops        : min=    2, max=   20, avg=11.66, stdev= 4.93, samples=876
  lat (msec)   : 50=1.68%, 100=81.54%, 250=14.96%, 500=1.82%
  cpu          : usr=0.64%, sys=87.40%, ctx=11862, majf=5120, minf=1305869
  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=11.7MiB/s (12.2MB/s), 11.7MiB/s-11.7MiB/s (12.2MB/s-12.2MB/s), io=5120MiB (5369MB), run=439345-439345msec