== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 15:05:22 (1771445122)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.26976 s, 16.7 MB/s
llite.lustre-ffffa03c02d16800.read_ahead_stats=clear
llite.lustre-ffffa03c02d16800.read_ahead_stats=
snapshot_time             1771445136.726110497 secs.nsecs
start_time                1771445130.236904143 secs.nsecs
elapsed_time              6.489206354 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=305067: Wed Feb 18 15:12:56 2026
  read: IOPS=11, BW=11.7MiB/s (12.3MB/s)(5120MiB/436529msec)
    clat (msec): min=45, max=315, avg=85.07, stdev=39.76
     lat (msec): min=45, max=315, avg=85.07, stdev=39.76
    clat percentiles (msec):
     |  1.00th=[   53],  5.00th=[   59], 10.00th=[   61], 20.00th=[   64],
     | 30.00th=[   65], 40.00th=[   67], 50.00th=[   69], 60.00th=[   72],
     | 70.00th=[   77], 80.00th=[   84], 90.00th=[  159], 95.00th=[  171],
     | 99.00th=[  224], 99.50th=[  245], 99.90th=[  275], 99.95th=[  292],
     | 99.99th=[  317]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=12045.01, stdev=4416.05, samples=870
   iops        : min=    2, max=   20, avg=11.75, stdev= 4.31, samples=870
  lat (msec)   : 50=0.16%, 100=82.89%, 250=16.54%, 500=0.41%
  cpu          : usr=0.60%, sys=87.01%, ctx=11695, majf=5121, minf=1305866
  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 (12.3MB/s), 11.7MiB/s-11.7MiB/s (12.3MB/s-12.3MB/s), io=5120MiB (5369MB), run=436529-436529msec