== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:27:43 (1709054863)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 3.64851 s, 28.7 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.0462335
Iter 1/10: OSS cache speed: 0.0144217
Iter 1/10: ladvise speed: 0.0441834
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.0625505
Iter 2/10: OSS cache speed: 0.0484721
Iter 2/10: ladvise speed: 0.0443522
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.126301
Iter 3/10: OSS cache speed: 0.307205
Iter 3/10: ladvise speed: 0.501671
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.433182
Iter 4/10: OSS cache speed: 0.505476
Iter 4/10: ladvise speed: 0.174901
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.93172
Iter 5/10: OSS cache speed: 0.901124
Iter 5/10: ladvise speed: 0.683161
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.307167
Iter 6/10: OSS cache speed: 0.0690141
Iter 6/10: ladvise speed: 0.327306
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.0223262
Iter 7/10: OSS cache speed: 0.268068
Iter 7/10: ladvise speed: 0.223264
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.0891236
Iter 8/10: OSS cache speed: 0.231025
Iter 8/10: ladvise speed: 0.0570443
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.325567
Iter 9/10: OSS cache speed: 0.361461
Iter 9/10: ladvise speed: 0.129761
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.522786
Iter 10/10: OSS cache speed: 0.92896
Iter 10/10: ladvise speed: 0.563389
Average uncached read: .28
Average speedup with OSS cached read: .36 = +28.57%
Average speedup with ladvise willread: .27 = +-3.57%
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches
fail_loc=0