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Round out diagnostic parameters (#157)
Add a libp2p over http test. Add max request in progress configurable parameter. Add block diagnostics. Add readme explaining parameters
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| # go-graphsync test-plan | ||
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| ### What This Does | ||
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| This test plan measures a series of transfers between two nodes with graphsync, optionally comparing them to HTTP. It offers a wide variety of configurable parameters, which are documented here. | ||
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| ### File Parameters | ||
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| These parameters configure the nature of the file that is transfered: | ||
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| - `size` - size of file to transfer, in human-friendly form | ||
| - **Default**: 1MiB | ||
| - `chunk_size` - unixfs chunk size (power of 2), controls the size of the leaves in file | ||
| - **Default**: 20 *(or 1MB chunks)* | ||
| - `links_per_level` - unixfs links per level, controlles UnixFS DAG shape (wide vs deep) | ||
| - **Default**: 1024 | ||
| - `raw_leaves` - should unixfs leaves be raw bytes (true), or wrapped as protonodes (false) | ||
| - **Default**: true | ||
| - `disk_store` - when we ingest the file to unix fs, should the blockstore where it lives be stored on disk (true) or memory (false) | ||
| - **Default**: default - false | ||
| - `concurrency` - number of files to construct and attempt to transfer *simultaneously* | ||
| - **Default**: 1 | ||
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| Why you might want to change these: | ||
| - obviously large file sizes more closely mirror use cases in a typical filecoin data transfer work load | ||
| - the links per level, chunk size, and raw leaves allow you to expriment with different dag structures and see how graphsync performs in different conditions | ||
| - the disk store allows you to measure the impact of datastore performance | ||
| - concurrency allows you to test how graphsync performs under heavy loads of attempting transfer many files simultaneously | ||
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| ### Networking Parameters | ||
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| These parameters control the parameters for the network layer | ||
| - `secure_channel` - type secure encoding for the libp2p channel | ||
| - **Default**: "noise" | ||
| - `latencies` - list of non-zero latencies to run the test under. | ||
| - **Default**: 100ms, 200ms, 300ms | ||
| - `no_latency_case` - also run a test case with no latency | ||
| - **Default**: true | ||
| - `bandwidths` - list limited bandwidths (egress bytes/s) to run the test under (written as humanized sizes). | ||
| - **Default**: 10M, 1M, 512kb | ||
| - `unlimited_bandwidth_case` - also run a test case with unlimited latency | ||
| - **Default**: true | ||
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| Why you might want to change these: | ||
| - we may pay a penalty for the cost of transfering over secure io | ||
| - bandwidth and latency parameters allow you to test graphsync under different network conditions. Importantly, these parameters generate a new test case for each instance, in a combinatorial form. So, if you you do two latencies and two bandwidths, you will get 4 rounds. And if concurrency is >1, each round with have more than one transfer | ||
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| ### Graphsync Options | ||
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| The parameters control values passed constructing graphsync that may affect overall performance. Their default values are the same default values is no value is passed to the graphsync constructor | ||
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| - `max_memory_per_peer` - the maximum amount of data a responder can buffer in memory for a single peer while it waits for it to be sent out over the wire | ||
| - **Default**: 16MB | ||
| - `max_memory_total` - the maximum amount of data a responder can buffer in memory for *all peers* while it waits for it to be sent out over the wire | ||
| - **Default**: 256MB | ||
| - `max_in_progress_requests` - The maximum number of requests Graphsync will respond to at once. When graphsync receives more than this number of simultaneous in bound requests, those after the first six (with a priotization that distributes evenly among peers) will wait for other requests to finish before they beginnin responding. | ||
| - **Default**: 6 | ||
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| These performance configuration parameters in GraphSync may cause bottlenecks with their default values. For example if the `concurrency` parameter is greater than 6, the remaining files will block until graphsync finishes some of the first 6. The buffering parameters may artificially lower performance on a fast connection. In a production context, they can be adjusted upwards based on the resources and goals of the graphsync node operator | ||
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| ### HTTP Comparison Parameters | ||
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| The parameters allow you to compare graphsync performance against transfer of the same data under similar conditions over HTTP | ||
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| - `compare_http` - run the HTTP comparison test | ||
| - **Default**: true | ||
| - `use_libp2p_http` - if we run the HTTP comparison test, should we use HTTP over libp2p (true) or just use standard HTTP on top of normal TCP/IP (false) | ||
| - **Default**: false | ||
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| ### Diagnostic Parameters | ||
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| These parameters control what kind of additional diagnostic data the test will generate | ||
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| - `memory_snapshots` - specifies whether we should take memory snapshots as we run. Has three potention values: *none* (no snapshots), *simple* (take snapshots at the end of each request) and *detailed* (take snap shots every 10 blocks when requests are executing). Note: snapshoting will take a snapshot, then run GC, then take a snapshot again. *detailed* should not be used in any scenario where you are measuring timings | ||
| - **Default**: none | ||
| - `block_diagnostics` - should we output detailed timings for block operations - blocks queued on the responder, blocks sent out on the network from the responder, responses received on the requestor, and blocks processed on the requestor | ||
| - **Default**: false |
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