== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:32:46 (1748989966)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.536288 s, 196 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: 3.3048
Iter 1/10: OSS cache speed: 3.46344
Iter 1/10: ladvise speed: 3.76309
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.98777
Iter 2/10: OSS cache speed: 3.52271
Iter 2/10: ladvise speed: 3.23168
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.30695
Iter 3/10: OSS cache speed: 4.04398
Iter 3/10: ladvise speed: 3.63957
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.07339
Iter 4/10: OSS cache speed: 3.48542
Iter 4/10: ladvise speed: 3.62648
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.22706
Iter 5/10: OSS cache speed: 5.97372
Iter 5/10: ladvise speed: 5.29949
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.1649
Iter 6/10: OSS cache speed: 6.01982
Iter 6/10: ladvise speed: 5.3166
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.99906
Iter 7/10: OSS cache speed: 4.64594
Iter 7/10: ladvise speed: 3.71953
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.98185
Iter 8/10: OSS cache speed: 3.24865
Iter 8/10: ladvise speed: 3.5594
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.84787
Iter 9/10: OSS cache speed: 3.59645
Iter 9/10: ladvise speed: 4.03063
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.30327
Iter 10/10: OSS cache speed: 3.51937
Iter 10/10: ladvise speed: 3.83455
Average uncached read: 3.31
Average speedup with OSS cached read:  4.15 = +25.37%
Average speedup with ladvise willread:  4.00 = +20.84%
Speedup with OSS cached read less than 20%,  got 4.15%. Skipping ladvise willread check.