== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 20:27:53 (1773620873)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.41267 s, 16.4 MB/s
llite.lustre-ffff9769ba57e800.read_ahead_stats=clear
llite.lustre-ffff9769ba57e800.read_ahead_stats=
snapshot_time             1773620889.088165456 secs.nsecs
start_time                1773620882.095177750 secs.nsecs
elapsed_time              6.992987706 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=291606: Sun Mar 15 20:35:57 2026
  read: IOPS=10, BW=10.0MiB/s (11.5MB/s)(5120MiB/465740msec)
    clat (msec): min=48, max=482, avg=90.79, stdev=52.50
     lat (msec): min=48, max=482, avg=90.79, stdev=52.50
    clat percentiles (msec):
     |  1.00th=[   53],  5.00th=[   61], 10.00th=[   63], 20.00th=[   65],
     | 30.00th=[   66], 40.00th=[   67], 50.00th=[   69], 60.00th=[   72],
     | 70.00th=[   78], 80.00th=[   85], 90.00th=[  163], 95.00th=[  224],
     | 99.00th=[  288], 99.50th=[  300], 99.90th=[  313], 99.95th=[  321],
     | 99.99th=[  481]
   bw (  KiB/s): min= 2031, max=18432, per=100.00%, avg=11290.24, stdev=4817.85, samples=928
   iops        : min=    1, max=   18, avg=11.02, stdev= 4.71, samples=928
  lat (msec)   : 50=0.06%, 100=82.40%, 250=14.08%, 500=3.46%
  cpu          : usr=0.60%, sys=87.59%, ctx=12093, majf=5120, minf=1305868
  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=10.0MiB/s (11.5MB/s), 10.0MiB/s-10.0MiB/s (11.5MB/s-11.5MB/s), io=5120MiB (5369MB), run=465740-465740msec