== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:09:56 (1737133796)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.735631 s, 143 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: 4.78636
Iter 1/10: OSS cache speed: 4.36095
Iter 1/10: ladvise speed: 3.03311
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.56037
Iter 2/10: OSS cache speed: 4.64883
Iter 2/10: ladvise speed: 4.61164
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.28533
Iter 3/10: OSS cache speed: 4.49621
Iter 3/10: ladvise speed: 4.78721
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.11221
Iter 4/10: OSS cache speed: 2.6196
Iter 4/10: ladvise speed: 2.35629
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.19757
Iter 5/10: OSS cache speed: 2.18761
Iter 5/10: ladvise speed: 2.14042
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.22691
Iter 6/10: OSS cache speed: 2.52063
Iter 6/10: ladvise speed: 2.50666
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.3873
Iter 7/10: OSS cache speed: 3.38427
Iter 7/10: ladvise speed: 4.19618
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.51437
Iter 8/10: OSS cache speed: 4.33555
Iter 8/10: ladvise speed: 2.80647
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.21494
Iter 9/10: OSS cache speed: 2.71203
Iter 9/10: ladvise speed: 3.63222
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.53336
Iter 10/10: OSS cache speed: 3.33959
Iter 10/10: ladvise speed: 3.07601
Average uncached read: 2.88
Average speedup with OSS cached read:  3.46 = +20.13%
Average speedup with ladvise willread:  3.31 = +14.93%
Speedup with OSS cached read less than 20%,  got 3.46%. Skipping ladvise willread check.