== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:18:11 (1713388691)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.508269 s, 206 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: 2.9626
Iter 1/10: OSS cache speed: 2.81859
Iter 1/10: ladvise speed: 2.89022
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.23076
Iter 2/10: OSS cache speed: 5.3717
Iter 2/10: ladvise speed: 4.78541
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.80401
Iter 3/10: OSS cache speed: 2.75377
Iter 3/10: ladvise speed: 2.81428
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.12375
Iter 4/10: OSS cache speed: 3.40867
Iter 4/10: ladvise speed: 4.00812
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.99814
Iter 5/10: OSS cache speed: 3.201
Iter 5/10: ladvise speed: 4.6216
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.23304
Iter 6/10: OSS cache speed: 2.99314
Iter 6/10: ladvise speed: 3.95817
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.2042
Iter 7/10: OSS cache speed: 3.06453
Iter 7/10: ladvise speed: 2.94612
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.94268
Iter 8/10: OSS cache speed: 3.77128
Iter 8/10: ladvise speed: 4.92828
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.50207
Iter 9/10: OSS cache speed: 4.27092
Iter 9/10: ladvise speed: 3.90286
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.38527
Iter 10/10: OSS cache speed: 4.60085
Iter 10/10: ladvise speed: 4.33031
Average uncached read: 3.63
Average speedup with OSS cached read:  3.62 = +-.27%
Average speedup with ladvise willread:  3.91 = +7.71%
Speedup with OSS cached read less than 20%,  got 3.62%. Skipping ladvise willread check.