== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:06:57 (1774530417)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.921345 s, 114 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: 2.78905
Iter 1/10: OSS cache speed: 3.7237
Iter 1/10: ladvise speed: 3.48468
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.89004
Iter 2/10: OSS cache speed: 3.9192
Iter 2/10: ladvise speed: 4.22039
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.55542
Iter 3/10: OSS cache speed: 4.25499
Iter 3/10: ladvise speed: 4.53398
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.74483
Iter 4/10: OSS cache speed: 3.41971
Iter 4/10: ladvise speed: 3.98184
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.9721
Iter 5/10: OSS cache speed: 3.46287
Iter 5/10: ladvise speed: 4.35164
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.41768
Iter 6/10: OSS cache speed: 3.978
Iter 6/10: ladvise speed: 3.89868
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.3359
Iter 7/10: OSS cache speed: 3.98688
Iter 7/10: ladvise speed: 3.90075
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.56327
Iter 8/10: OSS cache speed: 3.92946
Iter 8/10: ladvise speed: 3.88517
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.89835
Iter 9/10: OSS cache speed: 4.12189
Iter 9/10: ladvise speed: 3.86799
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.01475
Iter 10/10: OSS cache speed: 5.1134
Iter 10/10: ladvise speed: 4.7822
Average uncached read: 3.21
Average speedup with OSS cached read:  3.99 = +24.29%
Average speedup with ladvise willread:  4.09 = +27.41%
Speedup with OSS cached read less than 20%,  got 3.99%. Skipping ladvise willread check.