[Docs] Update main README.md and FAQ for missing python header #26
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Summary of Changes
Hello @haochengxia, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
I've updated the main README.md and the quickstart.md documentation to provide clearer and more comprehensive information, particularly regarding installation procedures and usage examples. The goal is to improve the onboarding experience for new users and provide better guidance for advanced features.
Highlights
- Installation Guidance: Significantly expanded the installation section in README.md to include quick installation, recommended uv usage, and detailed steps for installing advanced features like LRB, ThreeLCache, and GLCache, including dependency management scripts.
- Usage Examples: Added new Python code examples for cache simulation and updated the trace analysis example to demonstrate TraceAnalyzer usage more thoroughly.
- Plugin System Clarity: Refined the 'Custom Cache Policies' section, renaming it to 'Plugin System' and providing a more streamlined LRU implementation example using PluginCache hooks.
- Documentation Consistency: Made a minor update to docs/src/en/getting_started/quickstart.md to align with the new installation notes in README.md.
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Code Review
This pull request significantly improves the documentation in README.md by adding more features, detailed installation instructions, and code examples. The changes are clear and helpful for new users. I've found a couple of issues in the new code examples in README.md that would prevent them from running correctly. My review includes suggestions to fix these examples to make them runnable and correct.
| ```python | ||
| from collections import OrderedDict | ||
| from libcachesim import PluginCache, CommonCacheParams, Request, SyntheticReader, LRU | ||
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| class StandaloneLRU: | ||
| def __init__(self): | ||
| self.cache_data = OrderedDict() | ||
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| def cache_hit(self, obj_id): | ||
| if obj_id in self.cache_data: | ||
| obj_size = self.cache_data.pop(obj_id) | ||
| self.cache_data[obj_id] = obj_size | ||
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| def cache_miss(self, obj_id, obj_size): | ||
| self.cache_data[obj_id] = obj_size | ||
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| def cache_eviction(self): | ||
| evicted_id, _ = self.cache_data.popitem(last=False) | ||
| return evicted_id | ||
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| def cache_remove(self, obj_id): | ||
| if obj_id in self.cache_data: | ||
| del self.cache_data[obj_id] | ||
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| from typing import Any | ||
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| def cache_init_hook(common_cache_params: CommonCacheParams): | ||
| return StandaloneLRU() | ||
| from libcachesim import PluginCache, LRU, CommonCacheParams, Request | ||
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| def init_hook(_: CommonCacheParams) -> Any: | ||
| return OrderedDict() | ||
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| def cache_hit_hook(cache, request: Request): | ||
| cache.cache_hit(request.obj_id) | ||
| def hit_hook(data: Any, req: Request) -> None: | ||
| data.move_to_end(req.obj_id, last=True) | ||
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| def miss_hook(data: Any, req: Request) -> None: | ||
| data.__setitem__(req.obj_id, req.obj_size) | ||
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| def cache_miss_hook(cache, request: Request): | ||
| cache.cache_miss(request.obj_id, request.obj_size) | ||
| def eviction_hook(data: Any, _: Request) -> int: | ||
| return data.popitem(last=False)[0] | ||
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| def remove_hook(data: Any, obj_id: int) -> None: | ||
| data.pop(obj_id, None) | ||
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| def cache_eviction_hook(cache, request: Request): | ||
| return cache.cache_eviction() | ||
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| def cache_remove_hook(cache, obj_id): | ||
| cache.cache_remove(obj_id) | ||
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| def cache_free_hook(cache): | ||
| cache.cache_data.clear() | ||
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| def free_hook(data: Any) -> None: | ||
| data.clear() | ||
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| plugin_lru_cache = PluginCache( | ||
| cache_size=1024, | ||
| cache_init_hook=cache_init_hook, | ||
| cache_hit_hook=cache_hit_hook, | ||
| cache_miss_hook=cache_miss_hook, | ||
| cache_eviction_hook=cache_eviction_hook, | ||
| cache_remove_hook=cache_remove_hook, | ||
| cache_free_hook=cache_free_hook, | ||
| cache_name="CustomizedLRU", | ||
| cache_size=128, | ||
| cache_init_hook=init_hook, | ||
| cache_hit_hook=hit_hook, | ||
| cache_miss_hook=miss_hook, | ||
| cache_eviction_hook=eviction_hook, | ||
| cache_remove_hook=remove_hook, | ||
| cache_free_hook=free_hook, | ||
| cache_name="Plugin_LRU", | ||
| ) | ||
| ``` | ||
| </details> | ||
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| reader = lcs.SyntheticReader(num_objects=1000, num_of_req=10000, obj_size=1) | ||
| req_miss_ratio, byte_miss_ratio = plugin_lru_cache.process_trace(reader) | ||
| ref_req_miss_ratio, ref_byte_miss_ratio = LRU(128).process_trace(reader) | ||
| print(f"plugin req miss ratio {req_miss_ratio}, ref req miss ratio {ref_req_miss_ratio}") | ||
| print(f"plugin byte miss ratio {byte_miss_ratio}, ref byte miss ratio {ref_byte_miss_ratio}") | ||
| ``` |
There was a problem hiding this comment.
This code snippet has a few issues that prevent it from running correctly:
SyntheticReaderis used but not imported.- The
lcsalias is used to callSyntheticReader, butlcsis not defined.SyntheticReadershould be called directly after being imported. - The
readerobject is consumed by the firstprocess_tracecall. It needs to be reset withreader.reset()before it can be used again in the secondprocess_tracecall.
Here is a corrected version of the snippet that addresses these points:
from collections import OrderedDict
from typing import Any
from libcachesim import PluginCache, LRU, CommonCacheParams, Request, SyntheticReader
def init_hook(_: CommonCacheParams) -> Any:
return OrderedDict()
def hit_hook(data: Any, req: Request) -> None:
data.move_to_end(req.obj_id, last=True)
def miss_hook(data: Any, req: Request) -> None:
data.__setitem__(req.obj_id, req.obj_size)
def eviction_hook(data: Any, _: Request) -> int:
return data.popitem(last=False)[0]
def remove_hook(data: Any, obj_id: int) -> None:
data.pop(obj_id, None)
def free_hook(data: Any) -> None:
data.clear()
plugin_lru_cache = PluginCache(
cache_size=128,
cache_init_hook=init_hook,
cache_hit_hook=hit_hook,
cache_miss_hook=miss_hook,
cache_eviction_hook=eviction_hook,
cache_remove_hook=remove_hook,
cache_free_hook=free_hook,
cache_name="Plugin_LRU",
)
reader = SyntheticReader(num_objects=1000, num_of_req=10000, obj_size=1)
req_miss_ratio, byte_miss_ratio = plugin_lru_cache.process_trace(reader)
reader.reset() # Reset reader before re-using it
ref_req_miss_ratio, ref_byte_miss_ratio = LRU(128).process_trace(reader)
print(f"plugin req miss ratio {req_miss_ratio}, ref req miss ratio {ref_req_miss_ratio}")
print(f"plugin byte miss ratio {byte_miss_ratio}, ref byte miss ratio {ref_byte_miss_ratio}")| cache = lcs.S3FIFO(cache_size=1024*1024) | ||
| obj_miss_ratio, byte_miss_ratio = cache.process_trace( | ||
| reader, | ||
| start_req=0, | ||
| max_req=1000 | ||
| ) |
There was a problem hiding this comment.
The reader is consumed by the first cache.process_trace(reader) call. Without resetting it, the second call will start from the end of the trace and process zero requests. This is likely not the intended behavior for this example. You should add reader.reset() before re-initializing the cache for the second run to ensure the trace is processed from the beginning again.
Here is the corrected snippet:
# Step 4.1: Process with limited number of requests
reader.reset()
cache = lcs.S3FIFO(cache_size=1024*1024)
obj_miss_ratio, byte_miss_ratio = cache.process_trace(
reader,
start_req=0,
max_req=1000
)
print(f"Object miss ratio: {obj_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")
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