== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:28:09 (1790742489)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.4307 s, 9.2 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-ffff9cfb1034e800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.513159
Iter 1/10: OSS cache speed: 0.474022
Iter 1/10: ladvise speed: 0.522684
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.479354
Iter 2/10: OSS cache speed: 0.493925
Iter 2/10: ladvise speed: 0.370762
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.491512
Iter 3/10: OSS cache speed: 0.496545
Iter 3/10: ladvise speed: 0.460385
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.448484
Iter 4/10: OSS cache speed: 0.44989
Iter 4/10: ladvise speed: 0.470579
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.467189
Iter 5/10: OSS cache speed: 0.433456
Iter 5/10: ladvise speed: 0.451238
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.452592
Iter 6/10: OSS cache speed: 0.522616
Iter 6/10: ladvise speed: 0.521747
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.402097
Iter 7/10: OSS cache speed: 0.412965
Iter 7/10: ladvise speed: 0.536835
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.439482
Iter 8/10: OSS cache speed: 0.554038
Iter 8/10: ladvise speed: 0.478494
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.474678
Iter 9/10: OSS cache speed: 0.534837
Iter 9/10: ladvise speed: 0.499235
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.459637
Iter 10/10: OSS cache speed: 0.428216
Iter 10/10: ladvise speed: 0.478771
Average uncached read: .46
Average speedup with OSS cached read:  .48 = +4%
Average speedup with ladvise willread:  .47 = +2%
Speedup with OSS cached read less than 20%,  got 4%. Skipping ladvise willread check.
fail_loc=0