== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:57:42 (1785758262)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 20.1587 s, 5.2 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
llite.lustre-ffff94820a547000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.236794
Iter 1/10: OSS cache speed: 0.238581
Iter 1/10: ladvise speed: 0.262934
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.255058
Iter 2/10: OSS cache speed: 0.268586
Iter 2/10: ladvise speed: 0.209494
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.226869
Iter 3/10: OSS cache speed: 0.31363
Iter 3/10: ladvise speed: 0.280455
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.258592
Iter 4/10: OSS cache speed: 0.242913
Iter 4/10: ladvise speed: 0.291939
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.208884
Iter 5/10: OSS cache speed: 0.255844
Iter 5/10: ladvise speed: 0.247577
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.228785
Iter 6/10: OSS cache speed: 0.240135
Iter 6/10: ladvise speed: 0.262782
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.211326
Iter 7/10: OSS cache speed: 0.253449
Iter 7/10: ladvise speed: 0.296093
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.287313
Iter 8/10: OSS cache speed: 0.229109
Iter 8/10: ladvise speed: 0.205938
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.296223
Iter 9/10: OSS cache speed: 0.236038
Iter 9/10: ladvise speed: 0.279419
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.221502
Iter 10/10: OSS cache speed: 0.298263
Iter 10/10: ladvise speed: 0.292256
Average uncached read: .24
Average speedup with OSS cached read:  .25 = +4%
Average speedup with ladvise willread:  .26 = +8%
Speedup with OSS cached read less than 20%,  got 4%. Skipping ladvise willread check.
fail_loc=0