== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 07:50:34 (1773661834)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.91601 s, 17.7 MB/s
llite.lustre-ffffa03384f73000.read_ahead_stats=clear
llite.lustre-ffffa03384f73000.read_ahead_stats=
snapshot_time             1773661848.623097839 secs.nsecs
start_time                1773661842.075553843 secs.nsecs
elapsed_time              6.547543996 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=292829: Mon Mar 16 07:57:50 2026
  read: IOPS=12, BW=12.2MiB/s (12.8MB/s)(5120MiB/418986msec)
    clat (msec): min=43, max=277, avg=81.64, stdev=38.11
     lat (msec): min=43, max=277, avg=81.64, stdev=38.11
    clat percentiles (msec):
     |  1.00th=[   50],  5.00th=[   55], 10.00th=[   57], 20.00th=[   60],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   68], 60.00th=[   70],
     | 70.00th=[   74], 80.00th=[   84], 90.00th=[  144], 95.00th=[  157],
     | 99.00th=[  241], 99.50th=[  253], 99.90th=[  268], 99.95th=[  275],
     | 99.99th=[  279]
   bw (  KiB/s): min= 4079, max=20480, per=100.00%, avg=12544.58, stdev=4533.97, samples=835
   iops        : min=    3, max=   20, avg=12.23, stdev= 4.43, samples=835
  lat (msec)   : 50=1.27%, 100=80.10%, 250=18.07%, 500=0.57%
  cpu          : usr=0.57%, sys=87.57%, ctx=11768, majf=5125, minf=1305863
  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=12.2MiB/s (12.8MB/s), 12.2MiB/s-12.2MiB/s (12.8MB/s-12.8MB/s), io=5120MiB (5369MB), run=418986-418986msec