== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:10:12 (1747825812)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.58259 s, 180 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: 4.44269
Iter 1/10: OSS cache speed: 4.06037
Iter 1/10: ladvise speed: 4.36215
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.44865
Iter 2/10: OSS cache speed: 4.01366
Iter 2/10: ladvise speed: 3.42936
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.94542
Iter 3/10: OSS cache speed: 4.75234
Iter 3/10: ladvise speed: 4.72075
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.88559
Iter 4/10: OSS cache speed: 4.38331
Iter 4/10: ladvise speed: 3.87044
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.4689
Iter 5/10: OSS cache speed: 3.63553
Iter 5/10: ladvise speed: 4.04499
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.93278
Iter 6/10: OSS cache speed: 4.61398
Iter 6/10: ladvise speed: 4.3202
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.64092
Iter 7/10: OSS cache speed: 4.48082
Iter 7/10: ladvise speed: 4.45114
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.69976
Iter 8/10: OSS cache speed: 4.59799
Iter 8/10: ladvise speed: 4.46936
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.5149
Iter 9/10: OSS cache speed: 4.61683
Iter 9/10: ladvise speed: 4.83786
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.72716
Iter 10/10: OSS cache speed: 4.55349
Iter 10/10: ladvise speed: 4.73363
Average uncached read: 4.37
Average speedup with OSS cached read:  4.37 = +0%
Average speedup with ladvise willread:  4.32 = +-1.14%
Speedup with OSS cached read less than 20%,  got 4.37%. Skipping ladvise willread check.