== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:37:09 (1789299429)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 13.0673 s, 8.0 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-ffff976c05d3e800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.433739
Iter 1/10: OSS cache speed: 0.40116
Iter 1/10: ladvise speed: 0.354658
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.328875
Iter 2/10: OSS cache speed: 0.374096
Iter 2/10: ladvise speed: 0.311295
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.385332
Iter 3/10: OSS cache speed: 0.398987
Iter 3/10: ladvise speed: 0.403397
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.357335
Iter 4/10: OSS cache speed: 0.449409
Iter 4/10: ladvise speed: 0.364207
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.381716
Iter 5/10: OSS cache speed: 0.380131
Iter 5/10: ladvise speed: 0.382005
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.397869
Iter 6/10: OSS cache speed: 0.306946
Iter 6/10: ladvise speed: 0.402425
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.379088
Iter 7/10: OSS cache speed: 0.388132
Iter 7/10: ladvise speed: 0.346011
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.388835
Iter 8/10: OSS cache speed: 0.382443
Iter 8/10: ladvise speed: 0.355461
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.387576
Iter 9/10: OSS cache speed: 0.384163
Iter 9/10: ladvise speed: 0.386411
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.343942
Iter 10/10: OSS cache speed: 0.38982
Iter 10/10: ladvise speed: 0.356548
Average uncached read: .37
Average speedup with OSS cached read:  .38 = +2%
Average speedup with ladvise willread:  .36 = +-2%
Speedup with OSS cached read less than 20%,  got 2%. Skipping ladvise willread check.
fail_loc=0