== sanity test 255a: check 'lfs ladvise -a willread' ===== 00:00:23 (1744171223)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 2.64304 s, 39.7 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
llite.lustre-ffff88012e149800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 2.84345
Iter 1/10: OSS cache speed: 3.15832
Iter 1/10: ladvise speed: 3.31768
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.8556
Iter 2/10: OSS cache speed: 3.04695
Iter 2/10: ladvise speed: 3.31024
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.86461
Iter 3/10: OSS cache speed: 3.13907
Iter 3/10: ladvise speed: 3.23046
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.88482
Iter 4/10: OSS cache speed: 3.27287
Iter 4/10: ladvise speed: 3.40149
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.98467
Iter 5/10: OSS cache speed: 3.24578
Iter 5/10: ladvise speed: 3.29843
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.02826
Iter 6/10: OSS cache speed: 3.29247
Iter 6/10: ladvise speed: 3.29593
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.96086
Iter 7/10: OSS cache speed: 3.28891
Iter 7/10: ladvise speed: 3.20255
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.02368
Iter 8/10: OSS cache speed: 3.15538
Iter 8/10: ladvise speed: 3.01103
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.54075
Iter 9/10: OSS cache speed: 3.24535
Iter 9/10: ladvise speed: 3.28189
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.85173
Iter 10/10: OSS cache speed: 3.2905
Iter 10/10: ladvise speed: 3.28076
Average uncached read: 2.88
Average speedup with OSS cached read:  3.21 = +11%
Average speedup with ladvise willread:  3.26 = +13%
Speedup with OSS cached read less than 20%,  got 11%. Skipping ladvise willread check.
fail_loc=0