== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 07:11:25 (1777029085)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.87436 s, 17.9 MB/s
llite.lustre-ffffa0c1f965b000.read_ahead_stats=clear
llite.lustre-ffffa0c1f965b000.read_ahead_stats=
snapshot_time             1777029099.645908085 secs.nsecs
start_time                1777029093.335291108 secs.nsecs
elapsed_time              6.310616977 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=305906: Fri Apr 24 07:18:04 2026
  read: IOPS=13, BW=13.4MiB/s (14.1MB/s)(5120MiB/382086msec)
    clat (msec): min=43, max=265, avg=74.45, stdev=29.27
     lat (msec): min=43, max=265, avg=74.45, stdev=29.27
    clat percentiles (msec):
     |  1.00th=[   50],  5.00th=[   53], 10.00th=[   55], 20.00th=[   57],
     | 30.00th=[   59], 40.00th=[   62], 50.00th=[   64], 60.00th=[   66],
     | 70.00th=[   70], 80.00th=[   78], 90.00th=[  124], 95.00th=[  136],
     | 99.00th=[  184], 99.50th=[  199], 99.90th=[  218], 99.95th=[  232],
     | 99.99th=[  266]
   bw (  KiB/s): min= 4096, max=20480, per=100.00%, avg=13770.58, stdev=4271.35, samples=761
   iops        : min=    4, max=   20, avg=13.44, stdev= 4.17, samples=761
  lat (msec)   : 50=1.48%, 100=81.45%, 250=17.05%, 500=0.02%
  cpu          : usr=0.65%, sys=86.66%, ctx=11385, majf=5121, minf=1305867
  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=13.4MiB/s (14.1MB/s), 13.4MiB/s-13.4MiB/s (14.1MB/s-14.1MB/s), io=5120MiB (5369MB), run=382086-382086msec