== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:11:21 (1717153881)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.640242 s, 164 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=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 5.6896
Iter 1/10: OSS cache speed: 6.63695
Iter 1/10: ladvise speed: 6.65469
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.70809
Iter 2/10: OSS cache speed: 6.55928
Iter 2/10: ladvise speed: 6.47523
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.8723
Iter 3/10: OSS cache speed: 6.24729
Iter 3/10: ladvise speed: 5.64734
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.5791
Iter 4/10: OSS cache speed: 5.47341
Iter 4/10: ladvise speed: 6.26918
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.59219
Iter 5/10: OSS cache speed: 6.53298
Iter 5/10: ladvise speed: 4.68631
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.44237
Iter 6/10: OSS cache speed: 4.35968
Iter 6/10: ladvise speed: 6.51028
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.71306
Iter 7/10: OSS cache speed: 4.89386
Iter 7/10: ladvise speed: 4.84814
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.2083
Iter 8/10: OSS cache speed: 6.42049
Iter 8/10: ladvise speed: 6.25775
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.52819
Iter 9/10: OSS cache speed: 5.37255
Iter 9/10: ladvise speed: 5.56549
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.37106
Iter 10/10: OSS cache speed: 4.2032
Iter 10/10: ladvise speed: 4.1468
Average uncached read: 5.07
Average speedup with OSS cached read:  5.66 = +11.63%
Average speedup with ladvise willread:  5.70 = +12.42%
Speedup with OSS cached read less than 20%,  got 5.66%. Skipping ladvise willread check.