== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 19:19:52 (1775171992)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.85774 s, 15.3 MB/s
llite.lustre-ffffa002ec3de000.read_ahead_stats=clear
llite.lustre-ffffa002ec3de000.read_ahead_stats=
snapshot_time             1775172008.269880742 secs.nsecs
start_time                1775172001.208466918 secs.nsecs
elapsed_time              7.061413824 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=295225: Thu Apr  2 19:27:22 2026
  read: IOPS=11, BW=11.9MiB/s (12.4MB/s)(5120MiB/431400msec)
    clat (msec): min=48, max=502, avg=84.09, stdev=33.56
     lat (msec): min=48, max=502, avg=84.09, stdev=33.56
    clat percentiles (msec):
     |  1.00th=[   53],  5.00th=[   56], 10.00th=[   57], 20.00th=[   61],
     | 30.00th=[   65], 40.00th=[   69], 50.00th=[   73], 60.00th=[   79],
     | 70.00th=[   85], 80.00th=[   95], 90.00th=[  134], 95.00th=[  146],
     | 99.00th=[  215], 99.50th=[  228], 99.90th=[  245], 99.95th=[  253],
     | 99.99th=[  502]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=12187.71, stdev=3895.36, samples=860
   iops        : min=    2, max=   20, avg=11.89, stdev= 3.80, samples=860
  lat (msec)   : 50=0.47%, 100=81.17%, 250=18.26%, 500=0.08%, 750=0.02%
  cpu          : usr=0.62%, sys=85.97%, ctx=11899, 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=11.9MiB/s (12.4MB/s), 11.9MiB/s-11.9MiB/s (12.4MB/s-12.4MB/s), io=5120MiB (5369MB), run=431400-431400msec