== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 01:57:46 (1769065066)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.9393 s, 17.7 MB/s
llite.lustre-ffff8bf43a1ca000.read_ahead_stats=clear
llite.lustre-ffff8bf43a1ca000.read_ahead_stats=
snapshot_time             1769065079.462125122 secs.nsecs
start_time                1769065074.582866571 secs.nsecs
elapsed_time              4.879258551 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=292169: Thu Jan 22 02:03:51 2026
  read: IOPS=14, BW=14.6MiB/s (15.3MB/s)(5120MiB/349789msec)
    clat (msec): min=14, max=197, avg=68.12, stdev=28.39
     lat (msec): min=14, max=197, avg=68.12, stdev=28.39
    clat percentiles (msec):
     |  1.00th=[   41],  5.00th=[   47], 10.00th=[   48], 20.00th=[   50],
     | 30.00th=[   52], 40.00th=[   53], 50.00th=[   55], 60.00th=[   57],
     | 70.00th=[   61], 80.00th=[  106], 90.00th=[  114], 95.00th=[  121],
     | 99.00th=[  159], 99.50th=[  165], 99.90th=[  174], 99.95th=[  186],
     | 99.99th=[  199]
   bw (  KiB/s): min= 6107, max=22528, per=100.00%, avg=15032.49, stdev=5318.85, samples=697
   iops        : min=    5, max=   22, avg=14.61, stdev= 5.22, samples=697
  lat (msec)   : 20=0.04%, 50=21.78%, 100=55.61%, 250=22.58%
  cpu          : usr=0.70%, sys=84.98%, ctx=11545, majf=5171, minf=1305817
  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=14.6MiB/s (15.3MB/s), 14.6MiB/s-14.6MiB/s (15.3MB/s-15.3MB/s), io=5120MiB (5369MB), run=349789-349789msec