== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 23:26:33 (1767327993)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.05574 s, 14.9 MB/s
llite.lustre-ffff8b7751517000.read_ahead_stats=clear
llite.lustre-ffff8b7751517000.read_ahead_stats=
snapshot_time             1767328008.382268959 secs.nsecs
start_time                1767328002.923190686 secs.nsecs
elapsed_time              5.459078273 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=296708: Thu Jan  1 23:33:29 2026
  read: IOPS=12, BW=12.9MiB/s (13.5MB/s)(5120MiB/398119msec)
    clat (msec): min=38, max=292, avg=77.56, stdev=42.66
     lat (msec): min=38, max=292, avg=77.56, stdev=42.66
    clat percentiles (msec):
     |  1.00th=[   43],  5.00th=[   50], 10.00th=[   51], 20.00th=[   53],
     | 30.00th=[   54], 40.00th=[   56], 50.00th=[   59], 60.00th=[   63],
     | 70.00th=[   69], 80.00th=[  110], 90.00th=[  136], 95.00th=[  192],
     | 99.00th=[  218], 99.50th=[  224], 99.90th=[  234], 99.95th=[  239],
     | 99.99th=[  292]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=13199.05, stdev=5714.24, samples=793
   iops        : min=    4, max=   22, avg=12.87, stdev= 5.59, samples=793
  lat (msec)   : 50=8.81%, 100=69.14%, 250=22.03%, 500=0.02%
  cpu          : usr=0.67%, sys=84.80%, ctx=11694, majf=5129, minf=1305859
  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=12.9MiB/s (13.5MB/s), 12.9MiB/s-12.9MiB/s (13.5MB/s-13.5MB/s), io=5120MiB (5369MB), run=398119-398119msec