== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 03:38:48 (1773214728)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 21.0459 s, 5.0 MB/s
llite.lustre-ffff941ec9105000.read_ahead_stats=clear
llite.lustre-ffff941ec9105000.read_ahead_stats=
snapshot_time             1773214783.760955251 secs.nsecs
start_time                1773214759.249463503 secs.nsecs
elapsed_time              24.511491748 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          5 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=291831: Wed Mar 11 04:06:31 2026
  read: IOPS=3, BW=3285KiB/s (3364kB/s)(5120MiB/1595932msec)
    clat (msec): min=38, max=770, avg=310.69, stdev=86.74
     lat (msec): min=38, max=770, avg=310.70, stdev=86.74
    clat percentiles (msec):
     |  1.00th=[  129],  5.00th=[  182], 10.00th=[  205], 20.00th=[  239],
     | 30.00th=[  264], 40.00th=[  288], 50.00th=[  309], 60.00th=[  326],
     | 70.00th=[  351], 80.00th=[  376], 90.00th=[  422], 95.00th=[  460],
     | 99.00th=[  550], 99.50th=[  592], 99.90th=[  684], 99.95th=[  735],
     | 99.99th=[  768]
   bw (  KiB/s): min= 1799, max= 9696, per=100.00%, avg=3307.33, stdev=1218.69, samples=3140
   iops        : min=    1, max=    9, avg= 2.45, stdev= 1.26, samples=3140
  lat (msec)   : 50=0.06%, 100=0.43%, 250=23.83%, 500=73.36%, 750=2.30%
  lat (msec)   : 1000=0.02%
  cpu          : usr=0.23%, sys=23.83%, ctx=47662, majf=5829, minf=1305158
  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=3285KiB/s (3364kB/s), 3285KiB/s-3285KiB/s (3364kB/s-3364kB/s), io=5120MiB (5369MB), run=1595932-1595932msec