== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:54:06 (1721382846)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.565739 s, 185 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: 4.45265
Iter 1/10: OSS cache speed: 4.32777
Iter 1/10: ladvise speed: 3.79353
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.93403
Iter 2/10: OSS cache speed: 4.35712
Iter 2/10: ladvise speed: 6.62592
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.41788
Iter 3/10: OSS cache speed: 4.44615
Iter 3/10: ladvise speed: 3.93344
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.80765
Iter 4/10: OSS cache speed: 3.40407
Iter 4/10: ladvise speed: 3.52993
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.96312
Iter 5/10: OSS cache speed: 4.63413
Iter 5/10: ladvise speed: 4.24867
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.21354
Iter 6/10: OSS cache speed: 4.83546
Iter 6/10: ladvise speed: 5.72534
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.06192
Iter 7/10: OSS cache speed: 3.71095
Iter 7/10: ladvise speed: 4.65328
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.78102
Iter 8/10: OSS cache speed: 3.56193
Iter 8/10: ladvise speed: 3.31057
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.8264
Iter 9/10: OSS cache speed: 4.15469
Iter 9/10: ladvise speed: 3.64168
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.88538
Iter 10/10: OSS cache speed: 6.30101
Iter 10/10: ladvise speed: 6.18861
Average uncached read: 3.63
Average speedup with OSS cached read:  4.37 = +20.38%
Average speedup with ladvise willread:  4.56 = +25.61%
Speedup with OSS cached read less than 20%,  got 4.37%. Skipping ladvise willread check.