== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 03:34:38 (1769762078)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.3877 s, 16.4 MB/s
llite.lustre-ffff8f3d500ad000.read_ahead_stats=clear
llite.lustre-ffff8f3d500ad000.read_ahead_stats=
snapshot_time             1769762093.164850660 secs.nsecs
start_time                1769762087.009003021 secs.nsecs
elapsed_time              6.155847639 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=234551: Fri Jan 30 03:42:03 2026
  read: IOPS=11, BW=11.0MiB/s (12.5MB/s)(5120MiB/427911msec)
    clat (msec): min=44, max=279, avg=83.38, stdev=33.68
     lat (msec): min=44, max=279, avg=83.38, stdev=33.68
    clat percentiles (msec):
     |  1.00th=[   53],  5.00th=[   57], 10.00th=[   60], 20.00th=[   64],
     | 30.00th=[   66], 40.00th=[   69], 50.00th=[   71], 60.00th=[   73],
     | 70.00th=[   77], 80.00th=[   85], 90.00th=[  148], 95.00th=[  159],
     | 99.00th=[  190], 99.50th=[  201], 99.90th=[  224], 99.95th=[  228],
     | 99.99th=[  279]
   bw (  KiB/s): min= 4039, max=18432, per=100.00%, avg=12285.85, stdev=4040.31, samples=853
   iops        : min=    3, max=   18, avg=11.91, stdev= 3.96, samples=853
  lat (msec)   : 50=0.61%, 100=81.76%, 250=17.62%, 500=0.02%
  cpu          : usr=0.60%, sys=85.69%, ctx=13691, majf=5141, minf=1305849
  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=11.0MiB/s (12.5MB/s), 11.0MiB/s-11.0MiB/s (12.5MB/s-12.5MB/s), io=5120MiB (5369MB), run=427911-427911msec