== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 04:14:52 (1772183692)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.2568 s, 16.8 MB/s
llite.lustre-ffff923af2ead000.read_ahead_stats=clear
llite.lustre-ffff923af2ead000.read_ahead_stats=
snapshot_time             1772183707.012482105 secs.nsecs
start_time                1772183700.692053204 secs.nsecs
elapsed_time              6.320428901 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=291719: Fri Feb 27 04:23:17 2026
  read: IOPS=10, BW=10.5MiB/s (11.0MB/s)(5120MiB/487223msec)
    clat (msec): min=28, max=259, avg=94.95, stdev=30.43
     lat (msec): min=28, max=259, avg=94.95, stdev=30.43
    clat percentiles (msec):
     |  1.00th=[   64],  5.00th=[   69], 10.00th=[   71], 20.00th=[   75],
     | 30.00th=[   79], 40.00th=[   81], 50.00th=[   84], 60.00th=[   88],
     | 70.00th=[   95], 80.00th=[  107], 90.00th=[  153], 95.00th=[  167],
     | 99.00th=[  192], 99.50th=[  205], 99.90th=[  226], 99.95th=[  232],
     | 99.99th=[  259]
   bw (  KiB/s): min= 4055, max=14336, per=100.00%, avg=10786.38, stdev=2843.27, samples=969
   iops        : min=    3, max=   14, avg=10.14, stdev= 2.84, samples=969
  lat (msec)   : 50=0.25%, 100=75.57%, 250=24.16%, 500=0.02%
  cpu          : usr=0.57%, sys=70.44%, ctx=14205, majf=5296, minf=1305692
  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=10.5MiB/s (11.0MB/s), 10.5MiB/s-10.5MiB/s (11.0MB/s-11.0MB/s), io=5120MiB (5369MB), run=487223-487223msec