== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:30:51 (1715203851)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.480133 s, 218 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: 5.4709
Iter 1/10: OSS cache speed: 5.84703
Iter 1/10: ladvise speed: 6.05501
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.85169
Iter 2/10: OSS cache speed: 5.25862
Iter 2/10: ladvise speed: 5.21537
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.08595
Iter 3/10: OSS cache speed: 4.54645
Iter 3/10: ladvise speed: 4.7544
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.9422
Iter 4/10: OSS cache speed: 5.65775
Iter 4/10: ladvise speed: 5.66041
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.61041
Iter 5/10: OSS cache speed: 5.43053
Iter 5/10: ladvise speed: 5.45314
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.3797
Iter 6/10: OSS cache speed: 5.33565
Iter 6/10: ladvise speed: 5.23885
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.36872
Iter 7/10: OSS cache speed: 5.48495
Iter 7/10: ladvise speed: 5.2227
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.98995
Iter 8/10: OSS cache speed: 4.80379
Iter 8/10: ladvise speed: 4.77692
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.69593
Iter 9/10: OSS cache speed: 5.1152
Iter 9/10: ladvise speed: 5.2283
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.5694
Iter 10/10: OSS cache speed: 4.78521
Iter 10/10: ladvise speed: 4.90348
Average uncached read: 5.29
Average speedup with OSS cached read:  5.22 = +-1.32%
Average speedup with ladvise willread:  5.25 = +-.75%
Speedup with OSS cached read less than 20%,  got 5.22%. Skipping ladvise willread check.