== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:29:20 (1759843760)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.884039 s, 119 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: 3.771
Iter 1/10: OSS cache speed: 5.96556
Iter 1/10: ladvise speed: 5.7138
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.67196
Iter 2/10: OSS cache speed: 5.54888
Iter 2/10: ladvise speed: 5.31604
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.67172
Iter 3/10: OSS cache speed: 5.59711
Iter 3/10: ladvise speed: 5.46358
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.79936
Iter 4/10: OSS cache speed: 5.25766
Iter 4/10: ladvise speed: 5.35616
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.76584
Iter 5/10: OSS cache speed: 4.59469
Iter 5/10: ladvise speed: 5.71875
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.01386
Iter 6/10: OSS cache speed: 5.66944
Iter 6/10: ladvise speed: 5.66033
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.92361
Iter 7/10: OSS cache speed: 5.21558
Iter 7/10: ladvise speed: 4.73767
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.95749
Iter 8/10: OSS cache speed: 5.66317
Iter 8/10: ladvise speed: 5.7028
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.56883
Iter 9/10: OSS cache speed: 5.51833
Iter 9/10: ladvise speed: 5.20241
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.76575
Iter 10/10: OSS cache speed: 4.2235
Iter 10/10: ladvise speed: 4.09742
Average uncached read: 4.49
Average speedup with OSS cached read:  5.32 = +18.48%
Average speedup with ladvise willread:  5.29 = +17.81%
Speedup with OSS cached read less than 20%,  got 5.32%. Skipping ladvise willread check.