== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 23:40:02 (1772426402)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.1031 s, 17.2 MB/s
llite.lustre-ffff9a6a26511800.read_ahead_stats=clear
llite.lustre-ffff9a6a26511800.read_ahead_stats=
snapshot_time             1772426418.079177052 secs.nsecs
start_time                1772426410.778192058 secs.nsecs
elapsed_time              7.300984994 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=292235: Sun Mar  1 23:47:25 2026
  read: IOPS=12, BW=12.1MiB/s (12.7MB/s)(5120MiB/424164msec)
    clat (msec): min=48, max=292, avg=82.68, stdev=39.00
     lat (msec): min=48, max=292, avg=82.68, stdev=39.00
    clat percentiles (msec):
     |  1.00th=[   52],  5.00th=[   58], 10.00th=[   60], 20.00th=[   62],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   67], 60.00th=[   70],
     | 70.00th=[   74], 80.00th=[   82], 90.00th=[  153], 95.00th=[  163],
     | 99.00th=[  243], 99.50th=[  259], 99.90th=[  279], 99.95th=[  288],
     | 99.99th=[  292]
   bw (  KiB/s): min= 2048, max=18432, per=100.00%, avg=12399.17, stdev=4492.32, samples=845
   iops        : min=    2, max=   18, avg=12.10, stdev= 4.38, samples=845
  lat (msec)   : 50=0.33%, 100=82.64%, 250=16.15%, 500=0.88%
  cpu          : usr=0.61%, sys=88.20%, ctx=11847, majf=5120, 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=12.1MiB/s (12.7MB/s), 12.1MiB/s-12.1MiB/s (12.7MB/s-12.7MB/s), io=5120MiB (5369MB), run=424164-424164msec