== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 22:28:44 (1778293724)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.94736 s, 11.7 MB/s
llite.lustre-ffff9a4a73d9e800.read_ahead_stats=clear
llite.lustre-ffff9a4a73d9e800.read_ahead_stats=
snapshot_time             1778293748.245853567 secs.nsecs
start_time                1778293737.850397454 secs.nsecs
elapsed_time              10.395456113 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          4 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=294102: Fri May  8 22:45:22 2026
  read: IOPS=5, BW=5415KiB/s (5545kB/s)(5120MiB/968211msec)
    clat (msec): min=39, max=3806, avg=188.61, stdev=81.98
     lat (msec): min=39, max=3806, avg=188.62, stdev=81.98
    clat percentiles (msec):
     |  1.00th=[   91],  5.00th=[  115], 10.00th=[  125], 20.00th=[  140],
     | 30.00th=[  150], 40.00th=[  163], 50.00th=[  174], 60.00th=[  188],
     | 70.00th=[  207], 80.00th=[  232], 90.00th=[  271], 95.00th=[  300],
     | 99.00th=[  393], 99.50th=[  460], 99.90th=[  651], 99.95th=[  844],
     | 99.99th=[ 3809]
   bw (  KiB/s): min= 1414, max=10240, per=100.00%, avg=5460.25, stdev=1685.22, samples=1906
   iops        : min=    1, max=   10, avg= 4.63, stdev= 1.75, samples=1906
  lat (msec)   : 50=0.04%, 100=2.09%, 250=83.20%, 500=14.34%, 750=0.25%
  lat (msec)   : 1000=0.06%, >=2000=0.02%
  cpu          : usr=0.32%, sys=30.54%, ctx=30413, majf=5460, minf=1305530
  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=5415KiB/s (5545kB/s), 5415KiB/s-5415KiB/s (5545kB/s-5545kB/s), io=5120MiB (5369MB), run=968211-968211msec