== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 03:54:37 (1769763277)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.27908 s, 16.7 MB/s
llite.lustre-ffffa0adc0776000.read_ahead_stats=clear
llite.lustre-ffffa0adc0776000.read_ahead_stats=
snapshot_time             1769763292.327865857 secs.nsecs
start_time                1769763285.952569461 secs.nsecs
elapsed_time              6.375296396 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=291760: Fri Jan 30 04:02:03 2026
  read: IOPS=11, BW=11.0MiB/s (12.5MB/s)(5120MiB/428387msec)
    clat (msec): min=49, max=310, avg=83.50, stdev=38.52
     lat (msec): min=49, max=310, avg=83.50, stdev=38.52
    clat percentiles (msec):
     |  1.00th=[   52],  5.00th=[   59], 10.00th=[   61], 20.00th=[   63],
     | 30.00th=[   64], 40.00th=[   66], 50.00th=[   68], 60.00th=[   71],
     | 70.00th=[   75], 80.00th=[   84], 90.00th=[  155], 95.00th=[  163],
     | 99.00th=[  226], 99.50th=[  247], 99.90th=[  300], 99.95th=[  300],
     | 99.99th=[  309]
   bw (  KiB/s): min= 2048, max=18432, per=100.00%, avg=12273.33, stdev=4397.06, samples=854
   iops        : min=    2, max=   18, avg=11.98, stdev= 4.30, samples=854
  lat (msec)   : 50=0.04%, 100=82.87%, 250=16.62%, 500=0.47%
  cpu          : usr=0.58%, sys=87.44%, ctx=11637, majf=5120, minf=1305870
  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=428387-428387msec