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Use `open_sample_stream()` to increment fsp buffers

samplerd_service
Tyler Goodlet 2023-01-04 23:12:42 -05:00
parent b3d1b1aa63
commit e0ca5d5200
1 changed files with 10 additions and 9 deletions
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19
piker/fsp/_engine.py
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@ -39,7 +39,10 @@ from ..data.feed import (
Feed, Feed,
) )
from ..data._sharedmem import ShmArray from ..data._sharedmem import ShmArray
from ..data._sampling import _default_delay_s from ..data._sampling import (
_default_delay_s,
open_sample_stream,
)
from ..data._source import Symbol from ..data._source import Symbol
from ._api import ( from ._api import (
Fsp, Fsp,
@ -336,7 +339,6 @@ async def cascade(
symbol = flume.symbol symbol = flume.symbol
assert src.token == flume.rt_shm.token assert src.token == flume.rt_shm.token
profiler(f'{func}: feed up') profiler(f'{func}: feed up')
# last_len = new_len = len(src.array)
func_name = func.__name__ func_name = func.__name__
async with ( async with (
@ -442,22 +444,21 @@ async def cascade(
# signal # signal
times = src.array['time'] times = src.array['time']
if len(times) > 1: if len(times) > 1:
delay_s = times[-1] - times[times != times[-1]][-1] delay_s = float(times[-1] - times[times != times[-1]][-1])
else: else:
# our default "HFT" sample rate. # our default "HFT" sample rate.
delay_s = _default_delay_s delay_s = _default_delay_s
# Increment the underlying shared memory buffer on every # sub and increment the underlying shared memory buffer
# "increment" msg received from the underlying data feed. # on every step msg received from the global `samplerd`
async with flume.index_stream( # service.
int(delay_s) async with open_sample_stream(float(delay_s)) as istream:
) as istream:
profiler(f'{func_name}: sample stream up') profiler(f'{func_name}: sample stream up')
profiler.finish() profiler.finish()
async for i in istream: async for i in istream:
# print(f'FSP incrementing {i}') print(f'FSP incrementing {i}')
# respawn the compute task if the source # respawn the compute task if the source
# array has been updated such that we compute # array has been updated such that we compute